diff --git a/tests/conform/Makefile.am b/tests/conform/Makefile.am
index cb1f25ea3..69a460d2b 100644
--- a/tests/conform/Makefile.am
+++ b/tests/conform/Makefile.am
@@ -64,6 +64,7 @@ test_sources = \
 	test-texture-get-set-data.c \
 	test-framebuffer-get-bits.c \
 	test-primitive-and-journal.c \
+	test-copy-replace-texture.c \
 	$(NULL)
 
 test_conformance_SOURCES = $(common_sources) $(test_sources)
diff --git a/tests/conform/test-conform-main.c b/tests/conform/test-conform-main.c
index 8cae25eff..4110c8219 100644
--- a/tests/conform/test-conform-main.c
+++ b/tests/conform/test-conform-main.c
@@ -118,6 +118,8 @@ main (int argc, char **argv)
 
   ADD_TEST (test_primitive_and_journal, 0, 0);
 
+  ADD_TEST (test_copy_replace_texture, 0, TEST_KNOWN_FAILURE);
+
   UNPORTED_TEST (test_viewport);
 
   ADD_TEST (test_gles2_context, TEST_REQUIREMENT_GLES2_CONTEXT, 0);
diff --git a/tests/conform/test-copy-replace-texture.c b/tests/conform/test-copy-replace-texture.c
new file mode 100644
index 000000000..7d5ab489c
--- /dev/null
+++ b/tests/conform/test-copy-replace-texture.c
@@ -0,0 +1,121 @@
+#include <cogl/cogl.h>
+#include <string.h>
+
+#include "test-utils.h"
+
+/* Keep track of the number of textures that we've created and are
+ * still alive */
+static int alive_texture_mask = 0;
+
+#define N_LAYERS 3
+#define N_PIPELINES 4
+
+#define PIPELINE_LAYER_MASK(pipeline_num)                       \
+  (((1 << N_LAYERS) - 1) << (N_LAYERS * (pipeline_num) + 1))
+#define LAST_PIPELINE_MASK PIPELINE_LAYER_MASK (N_PIPELINES - 1)
+#define FIRST_PIPELINE_MASK PIPELINE_LAYER_MASK (0)
+
+static void
+free_texture_cb (void *user_data)
+{
+  int texture_num = GPOINTER_TO_INT (user_data);
+
+  alive_texture_mask &= ~(1 << texture_num);
+}
+
+static CoglTexture *
+create_texture (void)
+{
+  static const guint8 data[] =
+    { 0xff, 0xff, 0xff, 0xff };
+  static CoglUserDataKey texture_data_key;
+  CoglTexture2D *tex_2d;
+  static int texture_num = 1;
+
+  alive_texture_mask |= (1 << texture_num);
+
+  tex_2d = cogl_texture_2d_new_from_data (test_ctx,
+                                          1, 1, /* width / height */
+                                          COGL_PIXEL_FORMAT_RGBA_8888_PRE,
+                                          COGL_PIXEL_FORMAT_ANY,
+                                          4, /* rowstride */
+                                          data,
+                                          NULL);
+
+  /* Set some user data on the texture so we can track when it has
+   * been destroyed */
+  cogl_object_set_user_data (COGL_OBJECT (tex_2d),
+                             &texture_data_key,
+                             GINT_TO_POINTER (texture_num),
+                             free_texture_cb);
+
+  texture_num++;
+
+  return COGL_TEXTURE (tex_2d);
+}
+
+void
+test_copy_replace_texture (void)
+{
+  CoglPipeline *pipelines[N_PIPELINES];
+  int pipeline_num;
+
+  /* Create a set of pipeline copies each with three of their own
+   * replacement textures */
+  for (pipeline_num = 0; pipeline_num < N_PIPELINES; pipeline_num++)
+    {
+      int layer_num;
+
+      if (pipeline_num == 0)
+        pipelines[pipeline_num] = cogl_pipeline_new (test_ctx);
+      else
+        pipelines[pipeline_num] =
+          cogl_pipeline_copy (pipelines[pipeline_num - 1]);
+
+      for (layer_num = 0; layer_num < N_LAYERS; layer_num++)
+        {
+          CoglTexture *tex = create_texture ();
+          cogl_pipeline_set_layer_texture (pipelines[pipeline_num],
+                                           layer_num,
+                                           tex);
+          cogl_object_unref (tex);
+        }
+    }
+
+  /* Unref everything but the last pipeline */
+  for (pipeline_num = 0; pipeline_num < N_PIPELINES - 1; pipeline_num++)
+    cogl_object_unref (pipelines[pipeline_num]);
+
+  if (alive_texture_mask && cogl_test_verbose ())
+    {
+      int i;
+
+      g_print ("Alive textures:");
+
+      for (i = 0; i < N_PIPELINES * N_LAYERS; i++)
+        if ((alive_texture_mask & (1 << (i + 1))))
+          g_print (" %i", i);
+
+      g_print ("\n");
+    }
+
+  /* Ideally there should only be the textures from the last pipeline
+   * left alive. We also let Cogl keep the textures from the first
+   * texture alive because currently the child of the third layer in
+   * the first pipeline will retain its authority on the unit index
+   * state so that it can set it to 2. If there are more textures then
+   * it means the pipeline isn't correctly pruning redundant
+   * ancestors */
+  g_assert_cmpint (alive_texture_mask & ~FIRST_PIPELINE_MASK,
+                   ==,
+                   LAST_PIPELINE_MASK);
+
+  /* Clean up the last pipeline */
+  cogl_object_unref (pipelines[N_PIPELINES - 1]);
+
+  /* That should get rid of the last of the textures */
+  g_assert_cmpint (alive_texture_mask, ==, 0);
+
+  if (cogl_test_verbose ())
+    g_print ("OK\n");
+}