diff --git a/lib/cunit/cu_pc_patch.c b/lib/cunit/cu_pc_patch.c
index b775662..10ea49c 100644
--- a/lib/cunit/cu_pc_patch.c
+++ b/lib/cunit/cu_pc_patch.c
@@ -494,7 +494,8 @@ test_patch_wkb()
     pc_pointlist_free(pl1);
     pc_patch_free(pa1);
     pc_patch_free(pa2);
-    pc_patch_free((PCPATCH_DIMENSIONAL*)pa3);
+    /* WARNING: cannot free pa3, see https://github.com/pgpointcloud/pointcloud/issues/75 */
+    /*pc_patch_free((PCPATCH_DIMENSIONAL*)pa3);*/
     pc_patch_free(pa4);
     pc_patch_uncompressed_free(pu1);
     pc_patch_uncompressed_free(pu2);