+#if USE_DLMALLOC != 0
+ /*
+ * DLMALLOC is being "helpful" in that it ignores the heap size parameter
+ * by default and tries to allocate the larger amount of memory.
+ *
+ * Pin the heap so this does not happen and if we run out of memory
+ * in this heap, we will bail out with "out of memory", rather than
+ * an obscure error sometime later.
+ */
+ mspace_disable_expand(am->hash_lookup_mheap);
+#endif