diff --git a/debian/watch b/debian/watch
index f17c6982ba956fd2775c0f912fe53aaea701d2b5..8ae2148226ce6077038631a5818976455a79a3a3 100644
--- a/debian/watch
+++ b/debian/watch
@@ -1,2 +1,3 @@
 version=4
+opts="uversionmangle=s/_/./g" \
 https://sf.net/jregex/ jregex([\d\._]+)-src\.jar