diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c2e9752..78d6dcf 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -37,7 +37,8 @@ jobs:
     - name: Install dependencies
       run: python -m pip install --upgrade pip setuptools tox
     - name: Run tests
-      run: python -m tox --recreate -e test
+      # Disable coverage on PyPy
+      run: python -m tox --recreate -e test $(${{ startsWith(matrix.python-version, 'pypy') }} && echo '-- -n auto --no-cov')
 
   release:
     runs-on: ubuntu-latest
diff --git a/src/hypothesis_jsonschema/_encode.py b/src/hypothesis_jsonschema/_encode.py
index 8f1a423..2ef0608 100644
--- a/src/hypothesis_jsonschema/_encode.py
+++ b/src/hypothesis_jsonschema/_encode.py
@@ -9,7 +9,7 @@
 PYTHON_IMPLEMENTATION = platform.python_implementation()
 JSONType = Union[None, bool, float, str, list, Dict[str, Any]]
 
-if PYTHON_IMPLEMENTATION != "PyPy":
+if PYTHON_IMPLEMENTATION != "PyPy":  # pragma: no cover
     from json.encoder import _make_iterencode, encode_basestring_ascii  # type: ignore
 else:
     _make_iterencode = None
@@ -27,7 +27,7 @@ def _floatstr(o: float) -> str:
 
 class CanonicalisingJsonEncoder(json.JSONEncoder):
 
-    if PYTHON_IMPLEMENTATION == "PyPy":
+    if PYTHON_IMPLEMENTATION == "PyPy":  # pragma: no cover
 
         def _JSONEncoder__floatstr(self, o: float) -> str:  # noqa: N802
             return _floatstr(o)