diff --git a/make/defs.mk b/make/defs.mk
index 65ab23b7..2e95dddf 100644
--- a/make/defs.mk
+++ b/make/defs.mk
@@ -479,8 +479,8 @@ ifeq ($(USE_MPATROL),true)
 endif
 
 ifeq ($(USE_VALGRIND),true)
-	CFLAGS      += -include /usr/include/valgrind/memcheck.h
-	CPPFLAG     += -include /usr/include/valgrind/memcheck.h
+	CFLAGS      += -include /usr/include/valgrind/memcheck.h -D_VALGRIND_
+	CPPFLAG     += -include /usr/include/valgrind/memcheck.h -D_VALGRIND_
 	# LDFLAGS   += 
 endif