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-rw-r--r--tools/gpio/Makefile2
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/gpio/Makefile b/tools/gpio/Makefile
index 240eda014b371..6ecdd10678260 100644
--- a/tools/gpio/Makefile
+++ b/tools/gpio/Makefile
@@ -12,7 +12,7 @@ endif
# (this improves performance and avoids hard-to-debug behaviour);
MAKEFLAGS += -r
-CFLAGS += -O2 -Wall -g -D_GNU_SOURCE -I$(OUTPUT)include
+override CFLAGS += -O2 -Wall -g -D_GNU_SOURCE -I$(OUTPUT)include
ALL_TARGETS := lsgpio gpio-hammer gpio-event-mon
ALL_PROGRAMS := $(patsubst %,$(OUTPUT)%,$(ALL_TARGETS))