diff --git a/setup.py b/setup.py
index 91cd5b0..26f3622 100644
--- a/setup.py
+++ b/setup.py
@@ -71,7 +71,7 @@ setup(
         Extension(
             'piksemel',
             sources=['src/iksemel.c', 'src/pyiks.c'],
-            extra_compile_args=["-fvisibility=default"]
+            extra_compile_args=["-fvisibility=hidden"]
         )
     ],
     python_requires='>=3.6',
diff --git a/src/pyiks.c b/src/pyiks.c
index 5fab659..be28650 100644
--- a/src/pyiks.c
+++ b/src/pyiks.c
@@ -999,6 +999,7 @@ static struct PyModuleDef moduledef = {
     methods,             /* m_methods */
 };
 
+__attribute__((visibility("default")))
 PyMODINIT_FUNC
 PyInit_piksemel(void)
 {