diff --git a/graphics/scrot/Makefile b/graphics/scrot/Makefile
index 3b9373f8f435..5ae8b2c3bd90 100644
--- a/graphics/scrot/Makefile
+++ b/graphics/scrot/Makefile
@@ -19,6 +19,7 @@ USE_GITHUB=	yes
 GH_ACCOUNT=	resurrecting-open-source-projects
 
 USES=		autoreconf
+USE_CSTD=	c99
 GNU_CONFIGURE=	yes
 USE_XORG=	x11 xfixes xcursor