diff --git a/cmake/GetGitVersion.cmake b/cmake/GetGitVersion.cmake
index 423cf03d..e017fa30 100644
--- a/cmake/GetGitVersion.cmake
+++ b/cmake/GetGitVersion.cmake
@@ -38,7 +38,7 @@ function(get_git_version var)
       ERROR_QUIET)
   string(COMPARE NOTEQUAL "${GIT_DIFF_INDEX}" "" GIT_DIRTY)
   if (${GIT_DIRTY})
-      string(CONCAT GIT_VERSION ${GIT_VERSION} "-dirty")
+      set(GIT_VERSION "${GIT_VERSION}-dirty")
   endif()
   message("-- git Version: ${GIT_VERSION}")
   set(${var} ${GIT_VERSION} PARENT_SCOPE)