diff --git a/Makefile b/Makefile
index a0bda55b..23ffbfa6 100644
--- a/Makefile
+++ b/Makefile
@@ -111,7 +111,7 @@ heads_cc	:= $(CROSS)gcc \
 	-fdebug-prefix-map=$(pwd)=heads \
 	-gno-record-gcc-switches \
 	-D__MUSL__ \
-	-I$(INSTALL)/include \
+	-isystem $(INSTALL)/include \
 	-L$(INSTALL)/lib \
 
 CROSS_TOOLS_NOCC := \