diff --git a/x11/bbrun/Makefile b/x11/bbrun/Makefile
index 6af7d2bef24e..86a0790a0702 100644
--- a/x11/bbrun/Makefile
+++ b/x11/bbrun/Makefile
@@ -22,6 +22,9 @@ USE_CSTD=	gnu89
 PORTDOCS=	README
 PLIST_FILES=	bin/bbrun
 
+# Fix build with clang11
+CFLAGS+=	-fcommon
+
 do-install:
 	${INSTALL_PROGRAM} ${WRKSRC}/bbrun ${STAGEDIR}${PREFIX}/bin
 	@${MKDIR} ${STAGEDIR}${DOCSDIR}