diff --git a/src/jemalloc.c b/src/jemalloc.c
index 43a494e4..0983c00d 100644
--- a/src/jemalloc.c
+++ b/src/jemalloc.c
@@ -792,7 +792,7 @@ malloc_init_hard(void)
 	ncpus = malloc_ncpus();
 
 #if (!defined(JEMALLOC_MUTEX_INIT_CB) && !defined(JEMALLOC_ZONE) \
-    && !defined(_WIN32))
+    && !defined(_WIN32) && !defined(__native_client__))
 	/* LinuxThreads's pthread_atfork() allocates. */
 	if (pthread_atfork(jemalloc_prefork, jemalloc_postfork_parent,
 	    jemalloc_postfork_child) != 0) {