1 files changed, 1 insertions, 1 deletions
diff --git a/util.go b/util.go
index c811a1e..c1da665 100644
--- a/util.go
+++ b/util.go
@@ -50,7 +50,7 @@ func safeStringForId(in string) string {
 			id2 += "__"
 		} else if c == ':' {
 			id2 += "_"
-		} else if unicode.IsDigit(c) || unicode.IsLetter(c) {
+		} else if unicode.IsDigit(c) || unicode.IsLetter(c) || c == '.' || c == '-' || c == '_' {
 			id2 += string(c)
 		}
 	}