diff --git a/src/Makefile b/src/Makefile
index 827ce6bb..1ff03f83 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -481,6 +481,10 @@ ifeq ($(optimize),yes)
 			CXXFLAGS += -mdynamic-no-pic
 		endif
 	endif
+
+	ifeq ($(comp),clang)
+		CXXFLAGS += -fexperimental-new-pass-manager
+	endif
 endif
 
 ### 3.4 Bits