diff --git a/kitty/cocoa_window.m b/kitty/cocoa_window.m
index e0286df069..a660c555b8 100644
--- a/kitty/cocoa_window.m
+++ b/kitty/cocoa_window.m
@@ -939,7 +939,7 @@ - (BOOL)openFileURLs:(NSPasteboard*)pasteboard
 }
 
 static PyObject*
-cocoa_get_lang(PyObject UNUSED *self) {
+cocoa_get_lang(PyObject UNUSED *self, PyObject *args UNUSED) {
     @autoreleasepool {
     NSString* lang_code = [[NSLocale currentLocale] languageCode];
     NSString* country_code = [[NSLocale currentLocale] objectForKey:NSLocaleCountryCode];
diff --git a/kitty/core_text.m b/kitty/core_text.m
index 59d700c3df..af6301586d 100644
--- a/kitty/core_text.m
+++ b/kitty/core_text.m
@@ -1035,7 +1035,7 @@ static CTFontRef nerd_font(CGFloat sz) {
 }
 
 static PyObject*
-get_variation(CTFace *self) {
+get_variation(CTFace *self, PyObject *args UNUSED) {
     RAII_CoreFoundation(CFDictionaryRef, src, CTFontCopyVariation(self->ct_font));
     return variation_to_python(src);
 }
@@ -1062,7 +1062,7 @@ static CTFontRef nerd_font(CGFloat sz) {
 
 
 static PyObject*
-get_variable_data(CTFace *self) {
+get_variable_data(CTFace *self, PyObject *args UNUSED) {
     if (!ensure_name_table(self)) return NULL;
     RAII_PyObject(output, PyDict_New());
     if (!output) return NULL;
@@ -1078,7 +1078,7 @@ static CTFontRef nerd_font(CGFloat sz) {
 }
 
 static PyObject*
-identify_for_debug(CTFace *self) {
+identify_for_debug(CTFace *self, PyObject *args UNUSED) {
     RAII_PyObject(features, PyTuple_New(self->font_features.count)); if (!features) return NULL;
     char buf[128];
     for (unsigned i = 0; i < self->font_features.count; i++) {
@@ -1095,13 +1095,13 @@ static CTFontRef nerd_font(CGFloat sz) {
 // Boilerplate {{{
 
 static PyObject*
-display_name(CTFace *self) {
+display_name(CTFace *self, PyObject *args UNUSED) {
     CFStringRef dn = CTFontCopyDisplayName(self->ct_font);
     return convert_cfstring(dn, true);
 }
 
 static PyObject*
-postscript_name(CTFace *self) {
+postscript_name(CTFace *self, PyObject *args UNUSED) {
     return self->postscript_name ? Py_BuildValue("O", self->postscript_name) : PyUnicode_FromString("");
 }
 
diff --git a/kitty/data-types.c b/kitty/data-types.c
index d0ebae69c5..301b561b8c 100644
--- a/kitty/data-types.c
+++ b/kitty/data-types.c
@@ -42,14 +42,14 @@
 #include <xlocale.h>
 
 static PyObject*
-user_cache_dir(void) {
+user_cache_dir(PyObject *self UNUSED, PyObject *args UNUSED) {
     static char buf[1024];
     if (!confstr(_CS_DARWIN_USER_CACHE_DIR, buf, sizeof(buf) - 1)) return PyErr_SetFromErrno(PyExc_OSError);
     return PyUnicode_FromString(buf);
 }
 
 static PyObject*
-process_group_map(void) {
+process_group_map(PyObject *self UNUSED, PyObject *args UNUSED) {
     int num_of_processes = proc_listallpids(NULL, 0);
     size_t bufsize = sizeof(pid_t) * (num_of_processes + 1024);
     RAII_ALLOC(pid_t, buf, malloc(bufsize));