diff --git a/MunkeiVersionFromGit.cmake b/MunkeiVersionFromGit.cmake
index 15ab0d2..286e1e6 100644
--- a/MunkeiVersionFromGit.cmake
+++ b/MunkeiVersionFromGit.cmake
@@ -130,7 +130,7 @@ function( version_from_git )
 
     # Timestamp
     if( DEFINED ARG_TIMESTAMP )
-      string( TIMESTAMP timestamp "${ARG_TIMESTAMP}" ${ARG_UTC} )
+      string( TIMESTAMP timestamp "${ARG_TIMESTAMP}" UTC )
       list( APPEND metadata "${timestamp}" )
     endif( DEFINED ARG_TIMESTAMP )