diff --git a/progs/glsl/trirast.c b/progs/glsl/trirast.c
index 67cbac0546c..89df64fc718 100644
--- a/progs/glsl/trirast.c
+++ b/progs/glsl/trirast.c
@@ -190,7 +190,7 @@ Init(void)
       "}\n";
    static const char *vertShaderText =
       "void main() {\n"
-      "   gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n"
+      "   gl_Position = ftransform(); \n"
       "}\n";
 
    if (!ShadersSupported())