diff --git a/utils/ap51-flash/Makefile b/utils/ap51-flash/Makefile
index 483d32641..c64ad7e8a 100644
--- a/utils/ap51-flash/Makefile
+++ b/utils/ap51-flash/Makefile
@@ -31,7 +31,6 @@ TARGET_EXTRA_CFLAGS:=-DFLASH_FROM_FILE -DNO_LIBPCAP -D_GNU_SOURCE
 
 # pass optimization flags
 MAKE_FLAGS += \
-	OFLAGS="$(TARGET_CFLAGS)" \
 	EXTRA_CFLAGS="$(TARGET_EXTRA_CFLAGS)" \
 	REVISION="$(PKG_VERSION)" \
 	ap51-flash