diff --git a/ext/eglgles/gsteglglessink.c b/ext/eglgles/gsteglglessink.c
index 3cc314e7c8..60666d548a 100644
--- a/ext/eglgles/gsteglglessink.c
+++ b/ext/eglgles/gsteglglessink.c
@@ -294,8 +294,7 @@ static const char *frag_NV12_NV21_prog = {
       "  float r,g,b;"
       "  vec3 yuv;"
       "  yuv.x=texture2D(Ytex,opos).r;"
-      "  yuv.y=texture2D(UVtex,opos).%c;"
-      "  yuv.z=texture2D(UVtex,opos).%c;"
+      "  yuv.yz=texture2D(UVtex,opos).%c%c;"
       "  yuv += offset;"
       "  r = dot(yuv, rcoeff);"
       "  g = dot(yuv, gcoeff);"