diff --git a/bin/9c b/bin/9c
index b07d0149..0f836d24 100755
--- a/bin/9c
+++ b/bin/9c
@@ -20,6 +20,7 @@ usegcc()
 		-Wno-format-truncation \
 		-fno-omit-frame-pointer \
 		-fsigned-char \
+		-fcommon \
 	"
 	# want to put -fno-optimize-sibling-calls here but
 	# that option only works with gcc3+ it seems