diff --git a/lib/stdint.in.h b/lib/stdint.in.h
index e660cfb..f7c1278 100644
--- a/lib/stdint.in.h
+++ b/lib/stdint.in.h
@@ -136,7 +136,7 @@ typedef unsigned int gl_uint32_t;
 
 /* Do not undefine int64_t if gnulib is not being used with 64-bit
    types, since otherwise it breaks platforms like Tandem/NSK.  */
-#if LONG_MAX >> 31 >> 31 == 1
+#if LONG_MAX >> 31 >> 31 == 1 && !(defined (__APPLE__) && defined (__MACH__))
 # undef int64_t
 typedef long int gl_int64_t;
 # define int64_t gl_int64_t