diff --git a/gst/gl/effects/gstgleffectssources.c b/gst/gl/effects/gstgleffectssources.c
index aeaeb7d07b..6934712e9a 100644
--- a/gst/gl/effects/gstgleffectssources.c
+++ b/gst/gl/effects/gstgleffectssources.c
@@ -308,13 +308,22 @@ const gchar *hconv9_fragment_source =
   "uniform sampler2DRect tex;"
   "uniform float kernel[9];"
   "void main () {"
-  "  vec2 texturecoord = gl_TexCoord[0].st;"
-  "  texturecoord.s -= 4.0;"
+  "  vec2 texturecoord[10];"
+  "  float s = gl_TexCoord[0].s;"
+  "  float t = gl_TexCoord[0].t;"
+  "  texturecoord[0] = vec2(s-4.0, t);"
+  "  texturecoord[1] = vec2(s-3.0, t);"
+  "  texturecoord[2] = vec2(s-2.0, t);"
+  "  texturecoord[3] = vec2(s-1.0, t);"
+  "  texturecoord[4] = vec2(s, t);"
+  "  texturecoord[5] = vec2(s+1.0, t);"
+  "  texturecoord[6] = vec2(s+2.0, t);"
+  "  texturecoord[7] = vec2(s+3.0, t);"
+  "  texturecoord[8] = vec2(s+4.0, t);"
   "  int i;"
   "  vec4 sum = vec4 (0.0);"
   "  for (i = 0; i < 9; i++) { "
-  "    vec4 neighbor = texture2DRect(tex, texturecoord); "
-  "    ++texturecoord.s;"
+  "    vec4 neighbor = texture2DRect(tex, texturecoord[i]); "
   "    sum += neighbor * kernel[i];"
   "  }"
   "  gl_FragColor = sum;"
@@ -326,13 +335,22 @@ const gchar *vconv9_fragment_source =
   "uniform sampler2DRect tex;"
   "uniform float kernel[9];"
   "void main () {"
-  "  vec2 texturecoord = gl_TexCoord[0].st;"
-  "  texturecoord.t -= 4.0;"
+  "  vec2 texturecoord[9];"
+  "  float s = gl_TexCoord[0].s;"
+  "  float t = gl_TexCoord[0].t;"
+  "  texturecoord[0] = vec2(s, t-4.0);"
+  "  texturecoord[1] = vec2(s, t-3.0);"
+  "  texturecoord[2] = vec2(s, t-2.0);"
+  "  texturecoord[3] = vec2(s, t-1.0);"
+  "  texturecoord[4] = vec2(s, t);"
+  "  texturecoord[5] = vec2(s, t+1.0);"
+  "  texturecoord[6] = vec2(s, t+2.0);"
+  "  texturecoord[7] = vec2(s, t+3.0);"
+  "  texturecoord[8] = vec2(s, t+4.0);"
   "  int i;"
   "  vec4 sum = vec4 (0.0);"
   "  for (i = 0; i < 9; i++) { "
-  "    vec4 neighbor = texture2DRect(tex, texturecoord); "
-  "    ++texturecoord.t;"
+  "    vec4 neighbor = texture2DRect(tex, texturecoord[i]);"
   "    sum += neighbor * kernel[i]; "
   "  }"
   "  gl_FragColor = sum;"