diff --git a/src/racket/mzconfig.h.in b/src/racket/mzconfig.h.in
index 5be332ca36..7d7a37d63d 100644
--- a/src/racket/mzconfig.h.in
+++ b/src/racket/mzconfig.h.in
@@ -28,6 +28,9 @@
 /* Whether `uintptr_t' is available. */
 #undef HAVE_UINTPTR_T
 
+#ifdef HAVE_INTPTR_T
+# include <stdint.h>
+#endif
 #ifndef HAVE_INTPTR_T
 typedef long intptr_t;
 #endif