diff --git a/src/Makefile b/src/Makefile
index e527aa0..27149d7 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -12,7 +12,7 @@ $(info TARGET_SRC: $(TARGET_SRC))
 $(info CXX_SRC: $(CXX_SRC))
 
 # libDaisy Makefile variables
-CPPFLAGS=$(CXXFLAGS)
+CFLAGS=$(CXXFLAGS)
 SYSTEM_FILES_DIR=$(LIBDAISY_DIR)/core
 CPP_SOURCES=$(CXX_SRC)