diff --git a/toolchain/toolchain-external/ext-toolchain-wrapper.c b/toolchain/toolchain-external/ext-toolchain-wrapper.c
index e2d01dcd5b..b3b02d8e7c 100644
--- a/toolchain/toolchain-external/ext-toolchain-wrapper.c
+++ b/toolchain/toolchain-external/ext-toolchain-wrapper.c
@@ -177,11 +177,12 @@ int main(int argc, char **argv)
 
 #if defined(BR_ARCH) || \
     defined(BR_CPU)
-	/* Add our -march/cpu/abi flags, but only if none are
-	 * already specified on the commandline
+	/* Add our -march/cpu flags, but only if none of
+	 * -march/mtune/mcpu are already specified on the commandline
 	 */
 	for (i = 1; i < argc; i++) {
 		if (!strncmp(argv[i], "-march=", strlen("-march=")) ||
+		    !strncmp(argv[i], "-mtune=", strlen("-mtune=")) ||
 		    !strncmp(argv[i], "-mcpu=",  strlen("-mcpu=" )))
 			break;
 	}