diff --git a/games/generator_cbiere/generator_cbiere.SlackBuild b/games/generator_cbiere/generator_cbiere.SlackBuild
index de96929a20..b8d41d2090 100644
--- a/games/generator_cbiere/generator_cbiere.SlackBuild
+++ b/games/generator_cbiere/generator_cbiere.SlackBuild
@@ -63,7 +63,7 @@ find -L . \
  \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 \
  -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \;
 
-CFLAGS="$SLKCFLAGS" \
+CFLAGS="$SLKCFLAGS -std=gnu89" \
 CXXFLAGS="$SLKCFLAGS" \
 ./configure \
   --prefix=/usr \