diff --git a/kitty/data-types.c b/kitty/data-types.c
index 7ffbc2a69..0ebd8d7b3 100644
--- a/kitty/data-types.c
+++ b/kitty/data-types.c
@@ -58,7 +58,7 @@ static struct PyModuleDef module = {
 
 #include <termios.h>
 
-PyMODINIT_FUNC
+EXPORTED PyMODINIT_FUNC
 PyInit_fast_data_types(void) {
     PyObject *m;
 
diff --git a/kitty/data-types.h b/kitty/data-types.h
index 0f6137ef4..a3a86de63 100644
--- a/kitty/data-types.h
+++ b/kitty/data-types.h
@@ -13,6 +13,7 @@
 #define PY_SSIZE_T_CLEAN
 #include <Python.h>
 #define UNUSED __attribute__ ((unused))
+#define EXPORTED __attribute__ ((visibility ("default")))
 #define MAX(x, y) (((x) > (y)) ? (x) : (y))
 #define MIN(x, y) (((x) > (y)) ? (y) : (x))
 #define xstr(s) str(s)
diff --git a/setup.py b/setup.py
index 3127a0f11..f00b44193 100755
--- a/setup.py
+++ b/setup.py
@@ -115,7 +115,7 @@ def init_env(debug=False, sanitize=False, native_optimizations=True):
     cflags = os.environ.get(
         'OVERRIDE_CFLAGS', (
             '-Wextra -Wno-missing-field-initializers -Wall -std=c99 -D_XOPEN_SOURCE=700'
-            ' -pedantic-errors -Werror {} {} -D{}DEBUG -fwrapv {} {} -pipe {}'
+            ' -pedantic-errors -Werror {} {} -D{}DEBUG -fwrapv {} {} -pipe {} -fvisibility=hidden'
         ).format(
             optimize, ' '.join(sanitize_args), ('' if debug else 'N'), stack_protector, missing_braces, '-march=native'
             if native_optimizations else ''