diff --git a/llvm/include/llvm/Transforms/IPO.h b/llvm/include/llvm/Transforms/IPO.h
index 704d09b5f3d85..4995b000c4542 100644
--- a/llvm/include/llvm/Transforms/IPO.h
+++ b/llvm/include/llvm/Transforms/IPO.h
@@ -20,11 +20,8 @@
 
 namespace llvm {
 
-struct InlineParams;
 class ModulePass;
 class Pass;
-class BasicBlock;
-class GlobalValue;
 class raw_ostream;
 
 //===----------------------------------------------------------------------===//
diff --git a/llvm/include/llvm/Transforms/IPO/FunctionAttrs.h b/llvm/include/llvm/Transforms/IPO/FunctionAttrs.h
index 0b93bbd6eaa2d..6a21ff616d506 100644
--- a/llvm/include/llvm/Transforms/IPO/FunctionAttrs.h
+++ b/llvm/include/llvm/Transforms/IPO/FunctionAttrs.h
@@ -26,7 +26,6 @@ class GlobalValueSummary;
 class ModuleSummaryIndex;
 class Function;
 class Module;
-class Pass;
 
 /// Returns the memory access properties of this copy of the function.
 MemoryEffects computeFunctionBodyMemoryAccess(Function &F, AAResults &AAR);
diff --git a/llvm/include/llvm/Transforms/IPO/Internalize.h b/llvm/include/llvm/Transforms/IPO/Internalize.h
index 5beb925bb089d..ece5bfe77b798 100644
--- a/llvm/include/llvm/Transforms/IPO/Internalize.h
+++ b/llvm/include/llvm/Transforms/IPO/Internalize.h
@@ -28,7 +28,6 @@
 
 namespace llvm {
 class Module;
-class CallGraph;
 
 /// A pass that internalizes all functions and variables other than those that
 /// must be preserved according to \c MustPreserveGV.
diff --git a/llvm/include/llvm/Transforms/IPO/WholeProgramDevirt.h b/llvm/include/llvm/Transforms/IPO/WholeProgramDevirt.h
index bfa84b8015b3c..9e121d9c6f4ed 100644
--- a/llvm/include/llvm/Transforms/IPO/WholeProgramDevirt.h
+++ b/llvm/include/llvm/Transforms/IPO/WholeProgramDevirt.h
@@ -28,7 +28,6 @@ class Module;
 
 template <typename T> class ArrayRef;
 template <typename T> class MutableArrayRef;
-class Function;
 class GlobalVariable;
 class ModuleSummaryIndex;
 struct ValueInfo;