diff --git a/Sources/BuildSystemIntegration/BuildServerBuildSystem.swift b/Sources/BuildSystemIntegration/BuildServerBuildSystem.swift
index 2aabe68c..a448cd88 100644
--- a/Sources/BuildSystemIntegration/BuildServerBuildSystem.swift
+++ b/Sources/BuildSystemIntegration/BuildServerBuildSystem.swift
@@ -328,7 +328,7 @@ extension BuildServerBuildSystem: BuiltInBuildSystem {
     )
   }
 
-  package func waitForUpBuildSystemUpdates(request: WorkspaceWaitForBuildSystemUpdatesRequest) async -> VoidResponse {
+  package func waitForBuildSystemUpdates(request: WorkspaceWaitForBuildSystemUpdatesRequest) async -> VoidResponse {
     return VoidResponse()
   }
 }
diff --git a/Sources/BuildSystemIntegration/BuiltInBuildSystem.swift b/Sources/BuildSystemIntegration/BuiltInBuildSystem.swift
index af149abf..4e374dd7 100644
--- a/Sources/BuildSystemIntegration/BuiltInBuildSystem.swift
+++ b/Sources/BuildSystemIntegration/BuiltInBuildSystem.swift
@@ -71,5 +71,5 @@ package protocol BuiltInBuildSystem: AnyObject, Sendable {
   ) async throws -> TextDocumentSourceKitOptionsResponse?
 
   /// Wait until the build graph has been loaded.
-  func waitForUpBuildSystemUpdates(request: WorkspaceWaitForBuildSystemUpdatesRequest) async -> VoidResponse
+  func waitForBuildSystemUpdates(request: WorkspaceWaitForBuildSystemUpdatesRequest) async -> VoidResponse
 }
diff --git a/Sources/BuildSystemIntegration/BuiltInBuildSystemAdapter.swift b/Sources/BuildSystemIntegration/BuiltInBuildSystemAdapter.swift
index b3affd8b..b0a81472 100644
--- a/Sources/BuildSystemIntegration/BuiltInBuildSystemAdapter.swift
+++ b/Sources/BuildSystemIntegration/BuiltInBuildSystemAdapter.swift
@@ -167,7 +167,7 @@ package actor BuiltInBuildSystemAdapter: QueueBasedMessageHandler {
     case let request as RequestAndReply<WorkspaceBuildTargetsRequest>:
       await request.reply { try await underlyingBuildSystem.buildTargets(request: request.params) }
     case let request as RequestAndReply<WorkspaceWaitForBuildSystemUpdatesRequest>:
-      await request.reply { await underlyingBuildSystem.waitForUpBuildSystemUpdates(request: request.params) }
+      await request.reply { await underlyingBuildSystem.waitForBuildSystemUpdates(request: request.params) }
     default:
       await request.reply { throw ResponseError.methodNotFound(Request.method) }
     }
diff --git a/Sources/BuildSystemIntegration/CompilationDatabaseBuildSystem.swift b/Sources/BuildSystemIntegration/CompilationDatabaseBuildSystem.swift
index 3d9bc65f..cc25ba6d 100644
--- a/Sources/BuildSystemIntegration/CompilationDatabaseBuildSystem.swift
+++ b/Sources/BuildSystemIntegration/CompilationDatabaseBuildSystem.swift
@@ -48,7 +48,14 @@ fileprivate enum Cachable<Value> {
 ///
 /// Provides build settings from a `CompilationDatabase` found by searching a project. For now, only
 /// one compilation database, located at the project root.
-package actor CompilationDatabaseBuildSystem {
+package actor CompilationDatabaseBuildSystem: BuiltInBuildSystem {
+  static package func projectRoot(for workspaceFolder: AbsolutePath, options: SourceKitLSPOptions) -> AbsolutePath? {
+    if tryLoadCompilationDatabase(directory: workspaceFolder) != nil {
+      return workspaceFolder
+    }
+    return nil
+  }
+
   /// The compilation database.
   var compdb: CompilationDatabase? = nil {
     didSet {
@@ -58,14 +65,12 @@ package actor CompilationDatabaseBuildSystem {
     }
   }
 
-  package let connectionToSourceKitLSP: any Connection
+  private let connectionToSourceKitLSP: any Connection
+  private let searchPaths: [RelativePath]
+  private let fileSystem: FileSystem
 
   package let projectRoot: AbsolutePath
 
-  let searchPaths: [RelativePath]
-
-  let fileSystem: FileSystem
-
   private var _indexStorePath: Cachable<AbsolutePath?> = .noValue
   package var indexStorePath: AbsolutePath? {
     _indexStorePath.get {
@@ -87,6 +92,12 @@ package actor CompilationDatabaseBuildSystem {
     }
   }
 
+  package var indexDatabasePath: AbsolutePath? {
+    indexStorePath?.parentDirectory.appending(component: "IndexDatabase")
+  }
+
+  package nonisolated var supportsPreparation: Bool { false }
+
   package init?(
     projectRoot: AbsolutePath,
     searchPaths: [RelativePath],
@@ -103,21 +114,6 @@ package actor CompilationDatabaseBuildSystem {
       return nil
     }
   }
-}
-
-extension CompilationDatabaseBuildSystem: BuiltInBuildSystem {
-  static package func projectRoot(for workspaceFolder: AbsolutePath, options: SourceKitLSPOptions) -> AbsolutePath? {
-    if tryLoadCompilationDatabase(directory: workspaceFolder) != nil {
-      return workspaceFolder
-    }
-    return nil
-  }
-
-  package nonisolated var supportsPreparation: Bool { false }
-
-  package var indexDatabasePath: AbsolutePath? {
-    indexStorePath?.parentDirectory.appending(component: "IndexDatabase")
-  }
 
   package func buildTargets(request: WorkspaceBuildTargetsRequest) async throws -> WorkspaceBuildTargetsResponse {
     return WorkspaceBuildTargetsResponse(targets: [
@@ -135,10 +131,7 @@ extension CompilationDatabaseBuildSystem: BuiltInBuildSystem {
   }
 
   package func buildTargetSources(request: BuildTargetSourcesRequest) async throws -> BuildTargetSourcesResponse {
-    guard request.targets.contains(.dummy) else {
-      return BuildTargetSourcesResponse(items: [])
-    }
-    guard let compdb else {
+    guard request.targets.contains(.dummy), let compdb else {
       return BuildTargetSourcesResponse(items: [])
     }
     return BuildTargetSourcesResponse(items: [SourcesItem(target: .dummy, sources: compdb.sourceItems)])
@@ -157,7 +150,7 @@ extension CompilationDatabaseBuildSystem: BuiltInBuildSystem {
   package func sourceKitOptions(
     request: TextDocumentSourceKitOptionsRequest
   ) async throws -> TextDocumentSourceKitOptionsResponse? {
-    guard let db = database(for: request.textDocument.uri), let cmd = db[request.textDocument.uri].first else {
+    guard let compdb, let cmd = compdb[request.textDocument.uri].first else {
       return nil
     }
     return TextDocumentSourceKitOptionsResponse(
@@ -166,36 +159,10 @@ extension CompilationDatabaseBuildSystem: BuiltInBuildSystem {
     )
   }
 
-  package func waitForUpBuildSystemUpdates(request: WorkspaceWaitForBuildSystemUpdatesRequest) async -> VoidResponse {
+  package func waitForBuildSystemUpdates(request: WorkspaceWaitForBuildSystemUpdatesRequest) async -> VoidResponse {
     return VoidResponse()
   }
 
-  private func database(for uri: DocumentURI) -> CompilationDatabase? {
-    if let url = uri.fileURL, let path = try? AbsolutePath(validating: url.path) {
-      return database(for: path)
-    }
-    return compdb
-  }
-
-  private func database(for path: AbsolutePath) -> CompilationDatabase? {
-    if compdb == nil {
-      var dir = path
-      while !dir.isRoot {
-        dir = dir.parentDirectory
-        if let db = tryLoadCompilationDatabase(directory: dir, additionalSearchPaths: searchPaths, fileSystem) {
-          compdb = db
-          break
-        }
-      }
-    }
-
-    if compdb == nil {
-      logger.error("Could not open compilation database for \(path)")
-    }
-
-    return compdb
-  }
-
   private func fileEventShouldTriggerCompilationDatabaseReload(event: FileEvent) -> Bool {
     switch event.uri.fileURL?.lastPathComponent {
     case "compile_commands.json", "compile_flags.txt":
diff --git a/Sources/BuildSystemIntegration/SwiftPMBuildSystem.swift b/Sources/BuildSystemIntegration/SwiftPMBuildSystem.swift
index 96ca7667..d534f149 100644
--- a/Sources/BuildSystemIntegration/SwiftPMBuildSystem.swift
+++ b/Sources/BuildSystemIntegration/SwiftPMBuildSystem.swift
@@ -650,7 +650,7 @@ extension SwiftPMBuildSystem: BuildSystemIntegration.BuiltInBuildSystem {
     return []
   }
 
-  package func waitForUpBuildSystemUpdates(request: WorkspaceWaitForBuildSystemUpdatesRequest) async -> VoidResponse {
+  package func waitForBuildSystemUpdates(request: WorkspaceWaitForBuildSystemUpdatesRequest) async -> VoidResponse {
     await self.packageLoadingQueue.async {}.valuePropagatingCancellation
     return VoidResponse()
   }
diff --git a/Sources/BuildSystemIntegration/TestBuildSystem.swift b/Sources/BuildSystemIntegration/TestBuildSystem.swift
index dbc2e312..12b3ea6f 100644
--- a/Sources/BuildSystemIntegration/TestBuildSystem.swift
+++ b/Sources/BuildSystemIntegration/TestBuildSystem.swift
@@ -83,7 +83,7 @@ package actor TestBuildSystem: BuiltInBuildSystem {
     return buildSettingsByFile[request.textDocument.uri]
   }
 
-  package func waitForUpBuildSystemUpdates(request: WorkspaceWaitForBuildSystemUpdatesRequest) async -> VoidResponse {
+  package func waitForBuildSystemUpdates(request: WorkspaceWaitForBuildSystemUpdatesRequest) async -> VoidResponse {
     return VoidResponse()
   }
 
diff --git a/Tests/BuildSystemIntegrationTests/SwiftPMBuildSystemTests.swift b/Tests/BuildSystemIntegrationTests/SwiftPMBuildSystemTests.swift
index 940e73fc..864b3c2e 100644
--- a/Tests/BuildSystemIntegrationTests/SwiftPMBuildSystemTests.swift
+++ b/Tests/BuildSystemIntegrationTests/SwiftPMBuildSystemTests.swift
@@ -44,7 +44,7 @@ fileprivate extension SwiftPMBuildSystem {
   }
 
   func waitForUpToDateBuildGraph() async {
-    let _: VoidResponse = await self.waitForUpBuildSystemUpdates(request: WorkspaceWaitForBuildSystemUpdatesRequest())
+    let _: VoidResponse = await self.waitForBuildSystemUpdates(request: WorkspaceWaitForBuildSystemUpdatesRequest())
   }
 }