diff --git a/pyproject.toml b/pyproject.toml
index 9848873..b99bcb4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,6 +14,7 @@ homepage = "https://github.com/cmake-wheel/cmeel-urdfdom-headers"
 upstream = "https://github.com/ros/urdfdom_headers"
 
 [tool.cmeel]
+build-number = 1
 has-binaries = false
 has-sitelib = false
 run-tests = false