diff --git a/libraries/cal3d/cal3d.SlackBuild b/libraries/cal3d/cal3d.SlackBuild
index 15dc52eb44..e78c7c3a41 100644
--- a/libraries/cal3d/cal3d.SlackBuild
+++ b/libraries/cal3d/cal3d.SlackBuild
@@ -70,6 +70,7 @@ find -L . \
   -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \;
 
 patch -p1 < $CWD/cpp.patch
+sed -i -e "s|return false|return 0|g" src/cal3d/loader.cpp
 
 CFLAGS="$SLKCFLAGS" \
 CXXFLAGS="$SLKCFLAGS" \