diff --git a/scripts/python-skywater-pdk/skywater_pdk/liberty.py b/scripts/python-skywater-pdk/skywater_pdk/liberty.py
index 5916c40..617f22d 100755
--- a/scripts/python-skywater-pdk/skywater_pdk/liberty.py
+++ b/scripts/python-skywater-pdk/skywater_pdk/liberty.py
@@ -1149,5 +1149,7 @@
 
 if __name__ == "__main__":
     import doctest
-    doctest.testmod()
+    fail, _ = doctest.testmod()
+    if fail > 0:
+        sys.exit(1)
     sys.exit(main())