1 files changed, 2 insertions, 2 deletions
diff --git a/Source/cmArchiveWrite.h b/Source/cmArchiveWrite.h
index 72d8f3a..f847d09 100644
--- a/Source/cmArchiveWrite.h
+++ b/Source/cmArchiveWrite.h
@@ -72,13 +72,13 @@ public:
    * skip.  The remaining part of the input path is appended to the
    * "prefix" value to construct the final name in the archive.
    */
-  bool Add(std::string path, size_t skip = 0, const char* prefix = 0,
+  bool Add(std::string path, size_t skip = 0, const char* prefix = CM_NULLPTR,
            bool recursive = true);
 
   /** Returns true if there has been no error.  */
   operator safe_bool() const
   {
-    return this->Okay() ? &cmArchiveWrite::safe_bool_true : 0;
+    return this->Okay() ? &cmArchiveWrite::safe_bool_true : CM_NULLPTR;
   }
 
   /** Returns true if there has been an error.  */