diff --git a/math/gnumeric/Makefile b/math/gnumeric/Makefile
index 3114811bfbbf..315e28786438 100644
--- a/math/gnumeric/Makefile
+++ b/math/gnumeric/Makefile
@@ -32,6 +32,7 @@ WANT_GNOME=	yes
 USE_PYTHON=	yes
 INSTALLS_OMF=	yes
 USE_LDCONFIG=	yes
+USE_CSTD=	gnu89
 WANT_PERL=	yes
 INSTALLS_ICONS=	yes
 GNU_CONFIGURE=	yes