diff --git a/jemalloc/src/jemalloc.c b/jemalloc/src/jemalloc.c
index be3d7da1..40c3a637 100644
--- a/jemalloc/src/jemalloc.c
+++ b/jemalloc/src/jemalloc.c
@@ -1394,9 +1394,7 @@ JEMALLOC_P(dallocm)(void *ptr, int flags)
 
 /*
  * The following functions are used by threading libraries for protection of
- * malloc during fork().  These functions are only called if the program is
- * running in threaded mode, so there is no need to check whether the program
- * is threaded here.
+ * malloc during fork().
  */
 
 void
@@ -1404,8 +1402,6 @@ jemalloc_prefork(void)
 {
 	unsigned i;
 
-	assert(isthreaded);
-
 	/* Acquire all mutexes in a safe order. */
 
 	malloc_mutex_lock(&arenas_lock);
@@ -1432,8 +1428,6 @@ jemalloc_postfork(void)
 {
 	unsigned i;
 
-	assert(isthreaded);
-
 	/* Release all mutexes, now that fork() has completed. */
 
 #ifdef JEMALLOC_SWAP