diff --git a/devel/jq/Makefile b/devel/jq/Makefile
index b6695ac5039f9..6a157d70de198 100644
--- a/devel/jq/Makefile
+++ b/devel/jq/Makefile
@@ -18,6 +18,6 @@ USE_TOOLS+=	bison flex gmake
 
 GNU_CONFIGURE=	yes
 
-CFLAGS.SunOS+=	-D_XPG6
+CFLAGS.SunOS+=	-D_XPG6 -D__EXTENSIONS__
 
 .include "../../mk/bsd.pkg.mk"