diff --git a/Source/CPack/cmCPackArchiveGenerator.cxx b/Source/CPack/cmCPackArchiveGenerator.cxx
index 9d8edf80c..c9432ecc0 100644
--- a/Source/CPack/cmCPackArchiveGenerator.cxx
+++ b/Source/CPack/cmCPackArchiveGenerator.cxx
@@ -49,7 +49,7 @@ bool SetArchiveType(struct archive* a,
                      cmCPackArchiveGenerator::CompressType ct,
                      cmCPackArchiveGenerator::ArchiveType at)
 {
-  int res;
+  int res = 0;
   // pick the archive type
   switch(at)
     {