diff --git a/mozilla/js/src/jsemit.c b/mozilla/js/src/jsemit.c
index e606ab89500..3bff6f180d1 100644
--- a/mozilla/js/src/jsemit.c
+++ b/mozilla/js/src/jsemit.c
@@ -20,7 +20,9 @@
  * JS bytecode generation.
  */
 #include "jsstddef.h"
+#ifdef HAVE_MEMORY_H
 #include <memory.h>
+#endif
 #include <string.h>
 #include "jstypes.h"
 #include "jsarena.h" /* Added by JSIFY */
diff --git a/mozilla/js/src/jsopcode.c b/mozilla/js/src/jsopcode.c
index 3c8c9e24702..c164673407d 100644
--- a/mozilla/js/src/jsopcode.c
+++ b/mozilla/js/src/jsopcode.c
@@ -20,7 +20,9 @@
  * JS bytecode descriptors, disassemblers, and decompilers.
  */
 #include "jsstddef.h"
+#ifdef HAVE_MEMORY_H
 #include <memory.h>
+#endif
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/mozilla/js/src/jsscan.c b/mozilla/js/src/jsscan.c
index 46490ffc7f5..66028a254de 100644
--- a/mozilla/js/src/jsscan.c
+++ b/mozilla/js/src/jsscan.c
@@ -24,9 +24,10 @@
 #include <errno.h>
 #include <limits.h>
 #include <math.h>
+#ifdef HAVE_MEMORY_H
 #include <memory.h>
+#endif
 #include <stdarg.h>
-
 #include <stdlib.h>
 #include <string.h>
 #include "jstypes.h"