diff --git a/lldb/include/lldb/Core/ClangForward.h b/lldb/include/lldb/Core/ClangForward.h
index 245e2a154edc746..ede21e319d044b6 100644
--- a/lldb/include/lldb/Core/ClangForward.h
+++ b/lldb/include/lldb/Core/ClangForward.h
@@ -128,10 +128,6 @@ class APInt;
 class APSInt;
 class LLVMContext;
 class ExecutionEngine;
-class LLVMContext;
-class MemoryBuffer;
-class Module;
-class SourceMgr;
 class TargetOptions;
 }