diff --git a/Makefile b/Makefile
index b2e45f0..06ca994 100644
--- a/Makefile
+++ b/Makefile
@@ -41,7 +41,7 @@ CXX:=$(shell sh -c 'type $${CXX%% *} >/dev/null 2>/dev/null && echo $(CXX) || ec
 OPTIMIZATION?=-O3
 WARNINGS=-Wall -W -Wstrict-prototypes -Wwrite-strings
 DEBUG_FLAGS?= -g -ggdb
-REAL_CFLAGS=$(OPTIMIZATION) -fPIC $(CFLAGS) $(WARNINGS) $(DEBUG_FLAGS)
+REAL_CFLAGS=$(OPTIMIZATION) -fPIC $(CPPFLAGS) $(CFLAGS) $(WARNINGS) $(DEBUG_FLAGS)
 REAL_LDFLAGS=$(LDFLAGS)
 
 DYLIBSUFFIX=so