diff --git a/gfx/display_servers/dispserv_win32.c b/gfx/display_servers/dispserv_win32.c
index b070fb922c..29416312ed 100644
--- a/gfx/display_servers/dispserv_win32.c
+++ b/gfx/display_servers/dispserv_win32.c
@@ -306,8 +306,8 @@ static bool win32_display_server_set_resolution(void *data,
    return true;
 }
 
-void *win32_display_server_get_resolution_list(void *data,
-      unsigned *len)
+static void *win32_display_server_get_resolution_list(
+      void *data, unsigned *len)
 {
    DEVMODE dm                        = {0};
    unsigned i, j, count              = 0;