diff --git a/lib/FunctionNameDemangle/MangleHack.cpp b/lib/FunctionNameDemangle/MangleHack.cpp
index 421bba59397..f952dcf231c 100644
--- a/lib/FunctionNameDemangle/MangleHack.cpp
+++ b/lib/FunctionNameDemangle/MangleHack.cpp
@@ -27,7 +27,7 @@ _swift_mangleSimpleClass(const char *module, const char *class_) {
   size_t moduleLength = strlen(module);
   size_t classLength = strlen(class_);
   char *value = nullptr;
-  if (strcmp(module, "swift") == 0) {
+  if (strcmp(module, "Swift") == 0) {
     int result = asprintf(&value, "_TtCSs%zu%s", classLength, class_);
     assert(result > 0);
   } else {
@@ -41,13 +41,10 @@ _swift_mangleSimpleClass(const char *module, const char *class_) {
 
 const char *
 _swift_mangleSimpleProtocol(const char *module, const char *protocol) {
-  if (strcmp(module, "swift") == 0) {
-    module = "Ss";
-  }
   size_t moduleLength = strlen(module);
   size_t protocolLength = strlen(protocol);
   char *value = nullptr;
-  if (strcmp(module, "swift") == 0) {
+  if (strcmp(module, "Swift") == 0) {
     int result = asprintf(&value, "_TtPSs%zu%s_", protocolLength, protocol);
     assert(result > 0);
   } else {