diff --git a/xalan-c.spec b/xalan-c.spec
index 0bdfdc3..9b3737d 100644
--- a/xalan-c.spec
+++ b/xalan-c.spec
@@ -16,7 +16,7 @@ Summary:        Xalan XSLT processor for C/C++
 # of the binary RPMs.
 License:        Apache-2.0
 URL:            http://apache.github.io/xalan-c/
-%global tag Xalan-C_%(echo '%{version}' | tr . _)
+%global tag Xalan-C_%{gsub %{version} . _}
 %global tar_name xalan_c-%(echo %{version} | cut -d . -f -2)
 %global forgeurl https://github.com/apache/xalan-c/
 %global releaseurl %{forgeurl}/releases/download/%{tag}