diff --git a/Makefile b/Makefile
index 4927379184..0ad9a6c5bc 100644
--- a/Makefile
+++ b/Makefile
@@ -1826,7 +1826,7 @@ ifdef APPLE_COMMON_CRYPTO
 	COMPAT_CFLAGS += -DCOMMON_DIGEST_FOR_OPENSSL
 	BASIC_CFLAGS += -DSHA1_APPLE
 else
-	DC_SHA1 := YesPlease
+	override DC_SHA1 = YesPlease
 	BASIC_CFLAGS += -DSHA1_DC
 	LIB_OBJS += sha1dc_git.o
 ifdef DC_SHA1_EXTERNAL