diff --git a/.github/workflows/package-test.yml b/.github/workflows/package-test.yml
index 6a92d06..7944761 100644
--- a/.github/workflows/package-test.yml
+++ b/.github/workflows/package-test.yml
@@ -16,7 +16,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest]
+        os: [macos-latest, windows-latest, ubuntu-latest]
         python-version: [3.6, 3.7, 3.8, 3.9]
     steps:
       - uses: actions/checkout@v2
diff --git a/python_obfuscator/techniques.py b/python_obfuscator/techniques.py
index e0ea15d..9ada11f 100644
--- a/python_obfuscator/techniques.py
+++ b/python_obfuscator/techniques.py
@@ -11,7 +11,7 @@ def one_liner(code):
     formatted_code = re.sub(
         r"(;)\1+",
         ";",
-        """exec(\"\"\"{}\"\"\")""".format(
+        """exec(\"\"\"{};\"\"\")""".format(
             code.replace("\n", ";").replace('"""', '\\"\\"\\"')
         ),
     )