Check if UINT32_MAX is defined before redefining.

1 files changed, 5 insertions, 3 deletions

diff --git a/defines.h b/defines.h
index 6c816e782..a347a44ff 100644
--- a/defines.h
+++ b/defines.h
@@ -254,9 +254,11 @@ typedef unsigned int u_int32_t;
 #define __BIT_TYPES_DEFINED__
 #endif
 
-#if  defined(HAVE_DECL_UINT32_MAX) && (HAVE_DECL_UINT32_MAX == 0)
-# if (SIZEOF_INT == 4)
-#   define UINT32_MAX   UINT_MAX
+#ifndef UINT32_MAX
+# if defined(HAVE_DECL_UINT32_MAX) && (HAVE_DECL_UINT32_MAX == 0)
+#  if (SIZEOF_INT == 4)
+#    define UINT32_MAX  UINT_MAX
+#  endif
 # endif
 #endif