diff --git a/src/Makefile b/src/Makefile
index 4aa32cf2..794365f4 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -339,7 +339,7 @@ endif
 ifeq ($(pext),yes)
 	CXXFLAGS += -DUSE_PEXT
 	ifeq ($(comp),$(filter $(comp),gcc clang mingw))
-		CXXFLAGS += -mbmi2
+		CXXFLAGS += -mbmi2 -mavx2
 	endif
 endif