diff --git a/accessibility/jpilot/jpilot.SlackBuild b/accessibility/jpilot/jpilot.SlackBuild
index 32294b2035..78eeb3f868 100644
--- a/accessibility/jpilot/jpilot.SlackBuild
+++ b/accessibility/jpilot/jpilot.SlackBuild
@@ -70,8 +70,8 @@ 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="$SLKCFLAGS" \
-CXXFLAGS="$SLKCFLAGS" \
+CFLAGS="$SLKCFLAGS -std=gnu89" \
+CXXFLAGS="$SLKCFLAGS -std=gnu89" \
 ./configure \
   --prefix=/usr \
   --libdir=/usr/lib${LIBDIRSUFFIX} \