diff --git a/gx/gx_video.c b/gx/gx_video.c
index 4cabdf99b2..e0edcde101 100644
--- a/gx/gx_video.c
+++ b/gx/gx_video.c
@@ -270,7 +270,7 @@ const char *gx_get_video_mode(void)
    return format;
 }
 
-void gx_set_aspect_ratio(void *data, unsigned aspectratio_idx)
+static void gx_set_aspect_ratio(void *data, unsigned aspectratio_idx)
 {
    gx_video_t *gx = (gx_video_t*)driver.video_data;
 
diff --git a/gx/gx_video.h b/gx/gx_video.h
index 9a6e38f06c..5bd40ad0e4 100644
--- a/gx/gx_video.h
+++ b/gx/gx_video.h
@@ -32,8 +32,7 @@ typedef struct gx_video
 } gx_video_t;
 
 void gx_set_video_mode(unsigned fbWidth, unsigned lines);
-const char *gx_get_video_mode();
-void gx_set_aspect_ratio(void *data, unsigned aspectratio_idx);
+const char *gx_get_video_mode(void);
 
 #endif