diff --git a/src/Makefile b/src/Makefile
index 84ee7ab899c155f6f46514c94d9de70127d6d6a6..0e2c54321e330c43a964d8337faa07df07ea2643 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -19,7 +19,7 @@ help.inc: help.raw
 
 
 deps.mk: ${TARGETS} ${I_DSTS}
-	${CC} -MM ${TARGETS} > $@
+	${CC} ${CPPFLAGS} -MM ${TARGETS} > $@
 
 clean:
 	rm -f feh *.o *.inc