diff --git a/tests/conform/test-blend-strings.c b/tests/conform/test-blend-strings.c
index 12ada130f..14b7fbcc0 100644
--- a/tests/conform/test-blend-strings.c
+++ b/tests/conform/test-blend-strings.c
@@ -172,11 +172,13 @@ make_texture (guint32 color)
       *(--p) = r;
     }
 
+  /* Note: we don't use COGL_PIXEL_FORMAT_ANY for the internal format here
+   * since we don't want to allow Cogl to premultiply our data. */
   tex = cogl_texture_new_from_data (QUAD_WIDTH,
                                     QUAD_WIDTH,
                                     COGL_TEXTURE_NONE,
                                     COGL_PIXEL_FORMAT_RGBA_8888,
-                                    COGL_PIXEL_FORMAT_ANY,
+                                    COGL_PIXEL_FORMAT_RGBA_8888,
                                     QUAD_WIDTH * 4,
                                     tex_data);