diff --git a/Python/sysmodule.c b/Python/sysmodule.c
index 6c22b8f..1146746 100644
--- a/Python/sysmodule.c
+++ b/Python/sysmodule.c
@@ -1158,7 +1158,7 @@
 
 
 	svnversion = _Py_svnversion();
-	if (strcmp(svnversion, "exported") != 0)
+	if (strcmp(svnversion, "Unversioned directory") != 0 && strcmp(svnversion, "exported") != 0)
 		svn_revision = svnversion;
 	else if (istag) {
 		len = strlen(_patchlevel_revision);