diff --git a/include/swift/Basic/SourceManager.h b/include/swift/Basic/SourceManager.h
index 1072b8bd3b1..e5149f1146f 100644
--- a/include/swift/Basic/SourceManager.h
+++ b/include/swift/Basic/SourceManager.h
@@ -40,7 +40,7 @@ class SourceManager {
     int LineOffset;
   };
   std::map<const char *, VirtualFile> VirtualFiles;
-  mutable std::pair<const char *, const VirtualFile*> CachedVFile = {};
+  mutable std::pair<const char *, const VirtualFile*> CachedVFile = {nullptr, nullptr};
 
 public:
   llvm::SourceMgr &getLLVMSourceMgr() {
diff --git a/lib/Basic/SourceLoc.cpp b/lib/Basic/SourceLoc.cpp
index 9bc484c5eb7..b6e08734119 100644
--- a/lib/Basic/SourceLoc.cpp
+++ b/lib/Basic/SourceLoc.cpp
@@ -82,7 +82,7 @@ bool SourceManager::openVirtualFile(SourceLoc loc, StringRef name,
 
   CharSourceRange range = CharSourceRange(*this, loc, end);
   VirtualFiles[end.Value.getPointer()] = { range, name, lineOffset };
-  CachedVFile = {};
+  CachedVFile = {nullptr, nullptr};
   return true;
 }
 
@@ -99,7 +99,7 @@ void SourceManager::closeVirtualFile(SourceLoc end) {
 #endif
     return;
   }
-  CachedVFile = {};
+  CachedVFile = {nullptr, nullptr};
 
   CharSourceRange oldRange = virtualFile->Range;
   virtualFile->Range = CharSourceRange(*this, virtualFile->Range.getStart(),