diff --git a/jemalloc/configure.ac b/jemalloc/configure.ac
index b0d470a0..127b6951 100644
--- a/jemalloc/configure.ac
+++ b/jemalloc/configure.ac
@@ -710,6 +710,14 @@ if test "x${enable_tls}" = "x0" ; then
   AC_DEFINE_UNQUOTED([NO_TLS], [ ])
 fi
 
+dnl ============================================================================
+dnl Check for allocator-related functions that should be wrapped.
+
+AC_CHECK_FUNC([memalign],
+	      [AC_DEFINE([JEMALLOC_OVERRIDE_MEMALIGN])])
+AC_CHECK_FUNC([valloc],
+	      [AC_DEFINE([JEMALLOC_OVERRIDE_VALLOC])])
+
 dnl ============================================================================
 dnl Darwin-related configuration.
 
diff --git a/jemalloc/include/jemalloc/jemalloc_defs.h.in b/jemalloc/include/jemalloc/jemalloc_defs.h.in
index eed33a64..6bdcbaa4 100644
--- a/jemalloc/include/jemalloc/jemalloc_defs.h.in
+++ b/jemalloc/include/jemalloc/jemalloc_defs.h.in
@@ -98,6 +98,13 @@
  */
 #undef JEMALLOC_IVSALLOC
 
+/*
+ * Define overrides for non-standard allocator-related functions if they
+ * are present on the system.
+ */
+#undef JEMALLOC_OVERRIDE_MEMALIGN
+#undef JEMALLOC_OVERRIDE_VALLOC
+
 /*
  * Darwin (OS X) uses zones to work around Mach-O symbol override shortcomings.
  */
diff --git a/jemalloc/src/jemalloc.c b/jemalloc/src/jemalloc.c
index 0b60ce60..3f115d89 100644
--- a/jemalloc/src/jemalloc.c
+++ b/jemalloc/src/jemalloc.c
@@ -1145,6 +1145,45 @@ JEMALLOC_P(free)(void *ptr)
  * End malloc(3)-compatible functions.
  */
 /******************************************************************************/
+/*
+ * Begin non-standard override functions.
+ *
+ * These overrides are omitted if the JEMALLOC_PREFIX is defined, since the
+ * entire point is to avoid accidental mixed allocator usage.
+ */
+#ifndef JEMALLOC_PREFIX
+
+#ifdef JEMALLOC_OVERRIDE_MEMALIGN
+JEMALLOC_ATTR(malloc)
+JEMALLOC_ATTR(visibility("default"))
+void *
+JEMALLOC_P(memalign)(size_t alignment, size_t size)
+{
+	void *ret;
+
+	posix_memalign(&ret, alignment, size);
+	return (ret);
+}
+#endif
+
+#ifdef JEMALLOC_OVERRIDE_VALLOC
+JEMALLOC_ATTR(malloc)
+JEMALLOC_ATTR(visibility("default"))
+void *
+JEMALLOC_P(valloc)(size_t size)
+{
+	void *ret;
+
+	posix_memalign(&ret, PAGE_SIZE, size);
+	return (ret);
+}
+#endif
+
+#endif /* JEMALLOC_PREFIX */
+/*
+ * End non-standard override functions.
+ */
+/******************************************************************************/
 /*
  * Begin non-standard functions.
  */
@@ -1240,6 +1279,7 @@ iallocm(size_t size, size_t alignment, bool zero)
 		return (imalloc(size));
 }
 
+JEMALLOC_ATTR(nonnull(1))
 JEMALLOC_ATTR(visibility("default"))
 int
 JEMALLOC_P(allocm)(void **ptr, size_t *rsize, size_t size, int flags)
@@ -1297,6 +1337,7 @@ OOM:
 	return (ALLOCM_ERR_OOM);
 }
 
+JEMALLOC_ATTR(nonnull(1))
 JEMALLOC_ATTR(visibility("default"))
 int
 JEMALLOC_P(rallocm)(void **ptr, size_t *rsize, size_t size, size_t extra,
@@ -1369,6 +1410,7 @@ OOM:
 	return (ALLOCM_ERR_OOM);
 }
 
+JEMALLOC_ATTR(nonnull(1))
 JEMALLOC_ATTR(visibility("default"))
 int
 JEMALLOC_P(sallocm)(const void *ptr, size_t *rsize, int flags)
@@ -1389,6 +1431,7 @@ JEMALLOC_P(sallocm)(const void *ptr, size_t *rsize, int flags)
 	return (ALLOCM_SUCCESS);
 }
 
+JEMALLOC_ATTR(nonnull(1))
 JEMALLOC_ATTR(visibility("default"))
 int
 JEMALLOC_P(dallocm)(void *ptr, int flags)