diff --git a/progs/fp/tri-dst.c b/progs/fp/tri-dst.c
index 5e01a3c..ba40a24 100644
--- a/progs/fp/tri-dst.c
+++ b/progs/fp/tri-dst.c
@@ -40,7 +40,7 @@
 {
    static const char *modulate2D =
       "!!ARBfp1.0\n"
-      "DST result.color, fragment.position, fragment.color; \n"
+      "DST result.color, fragment.color, fragment.color; \n"
       "END"
       ;
    GLuint modulateProg;