diff --git a/kitty/disk-cache.c b/kitty/disk-cache.c
index a32c85835..a15d886d3 100644
--- a/kitty/disk-cache.c
+++ b/kitty/disk-cache.c
@@ -732,7 +732,7 @@ end:
     return data;
 }
 
-size_t
+static size_t
 disk_cache_clear_from_ram(PyObject *self_, bool(matches)(void*, void *key, unsigned keysz), void *data) {
     DiskCache *self = (DiskCache*)self_;
     size_t ans = 0;
diff --git a/kitty/disk-cache.h b/kitty/disk-cache.h
index d6c1ea26f..3b5a971b1 100644
--- a/kitty/disk-cache.h
+++ b/kitty/disk-cache.h
@@ -16,7 +16,6 @@ PyObject* read_from_disk_cache_python(PyObject *self_, const void *key, size_t k
 bool disk_cache_wait_for_write(PyObject *self, monotonic_t timeout);
 size_t disk_cache_total_size(PyObject *self);
 size_t disk_cache_size_on_disk(PyObject *self);
-size_t disk_cache_clear_from_ram(PyObject *self_, bool(matches)(void* data, void *key, unsigned keysz), void*);
 size_t disk_cache_num_cached_in_ram(PyObject *self_);
 
 static inline void* disk_cache_malloc_allocator(void *x, size_t sz) {