diff --git a/src/cwhy/__main__.py b/src/cwhy/__main__.py
index 8d1980c..2ce0984 100755
--- a/src/cwhy/__main__.py
+++ b/src/cwhy/__main__.py
@@ -103,3 +103,6 @@ def main():
         stdin = sys.stdin.read()
         if stdin:
             print(cwhy.evaluate(args, stdin))
+
+if __name__ == "__main__":
+    main()