diff --git a/example-makefile.make b/example-makefile.make
index 9fde949..b75dc82 100644
--- a/example-makefile.make
+++ b/example-makefile.make
@@ -86,6 +86,7 @@ clean:
 ci-version:
 	@VERSION=$$(sed -n "s/^-- version: //p" inc/meta/meta.header.lua | head -n 1 | tr -d "[:space:]"); \
 	BRANCH=$${CI_COMMIT_BRANCH:-$${WOODPECKER_BRANCH}}; \
+	BRANCH=$$(echo "$$BRANCH" | tr '/' '-'); \
 	if [ "$$BRANCH" != "main" ] && [ "$$BRANCH" != "master" ] && [ -n "$$BRANCH" ]; then \
 		VERSION=dev-$$VERSION-$$BRANCH; \
 	fi; \