diff --git a/include/llvm/Support/Debug.h b/include/llvm/Support/Debug.h
index 896fe849a6b..27024082962 100644
--- a/include/llvm/Support/Debug.h
+++ b/include/llvm/Support/Debug.h
@@ -26,9 +26,9 @@
 #ifndef LLVM_SUPPORT_DEBUG_H
 #define LLVM_SUPPORT_DEBUG_H
 
-namespace llvm {
+#include "llvm/Support/raw_ostream.h"
 
-class raw_ostream;
+namespace llvm {
 
 /// DEBUG_TYPE macro - Files can specify a DEBUG_TYPE as a string, which causes
 /// all of their DEBUG statements to be activatable with -debug-only=thatstring.