diff --git a/include/jemalloc/internal/jemalloc_internal.h.in b/include/jemalloc/internal/jemalloc_internal.h.in
index 35c05f4e..c21c218b 100644
--- a/include/jemalloc/internal/jemalloc_internal.h.in
+++ b/include/jemalloc/internal/jemalloc_internal.h.in
@@ -144,10 +144,6 @@ static const bool config_ivsalloc =
 #include <malloc/malloc.h>
 #endif
 
-#ifdef JEMALLOC_LAZY_LOCK
-#include <dlfcn.h>
-#endif
-
 #define	RB_COMPACT
 #include "jemalloc/internal/rb.h"
 #include "jemalloc/internal/qr.h"
diff --git a/src/jemalloc.c b/src/jemalloc.c
index 535efaa1..ccc3a209 100644
--- a/src/jemalloc.c
+++ b/src/jemalloc.c
@@ -1272,6 +1272,30 @@ JEMALLOC_P(valloc)(size_t size)
 }
 #endif
 
+#if defined(__GLIBC__) && !defined(__UCLIBC__)
+/*
+ * glibc provides the RTLD_DEEPBIND flag for dlopen which can make it possible
+ * to inconsistently reference libc's malloc(3)-compatible functions
+ * (https://bugzilla.mozilla.org/show_bug.cgi?id=493541).
+ *
+ * These definitions interpose hooks in glibc.  The functions are actually
+ * passed an extra argument for the caller return address, which will be
+ * ignored.
+ */
+JEMALLOC_ATTR(visibility("default"))
+void (* const __free_hook)(void *ptr) = JEMALLOC_P(free);
+
+JEMALLOC_ATTR(visibility("default"))
+void *(* const __malloc_hook)(size_t size) = JEMALLOC_P(malloc);
+
+JEMALLOC_ATTR(visibility("default"))
+void *(* const __realloc_hook)(void *ptr, size_t size) = JEMALLOC_P(realloc);
+
+JEMALLOC_ATTR(visibility("default"))
+void *(* const __memalign_hook)(size_t alignment, size_t size) =
+    JEMALLOC_P(memalign);
+#endif
+
 #endif /* JEMALLOC_PREFIX */
 /*
  * End non-standard override functions.
diff --git a/src/mutex.c b/src/mutex.c
index ca89ef1c..0e09060e 100644
--- a/src/mutex.c
+++ b/src/mutex.c
@@ -1,6 +1,10 @@
 #define	JEMALLOC_MUTEX_C_
 #include "jemalloc/internal/jemalloc_internal.h"
 
+#ifdef JEMALLOC_LAZY_LOCK
+#include <dlfcn.h>
+#endif
+
 /******************************************************************************/
 /* Data. */