diff --git a/drivers/clk/clk-gate-shared.c b/drivers/clk/clk-gate-shared.c
index a95f940..c3b678a 100644
--- a/drivers/clk/clk-gate-shared.c
+++ b/drivers/clk/clk-gate-shared.c
@@ -69,8 +69,8 @@
 	.is_enabled = clk_gate_shared_is_enabled,
 };
 
-struct clk *clk_gate_shared_alloc(const char *name, const char *parent, const char *companion,
-			   unsigned flags)
+static struct clk *clk_gate_shared_alloc(const char *name, const char *parent,
+				const char *companion, unsigned flags)
 {
 	struct clk_gate_shared *g = xzalloc(sizeof(*g));
 
@@ -86,7 +86,7 @@
 	return &g->clk;
 }
 
-void clk_gate_shared_free(struct clk *clk)
+static void clk_gate_shared_free(struct clk *clk)
 {
 	struct clk_gate_shared *g = to_clk_gate_shared(clk);
 
diff --git a/include/gui/image_renderer.h b/include/gui/image_renderer.h
index e0b1eae..bfdea1b 100644
--- a/include/gui/image_renderer.h
+++ b/include/gui/image_renderer.h
@@ -32,7 +32,7 @@
 
 #ifdef CONFIG_IMAGE_RENDERER
 int image_renderer_register(struct image_renderer *ir);
-void image_render_unregister(struct image_renderer *ir);
+void image_renderer_unregister(struct image_renderer *ir);
 
 int image_renderer_image(struct screen *sc, struct surface *s, struct image *img);
 
diff --git a/lib/gui/bmp.c b/lib/gui/bmp.c
index 143aa28..8bffc70 100644
--- a/lib/gui/bmp.c
+++ b/lib/gui/bmp.c
@@ -9,7 +9,7 @@
 #include <gui/image_renderer.h>
 #include <asm/unaligned.h>
 
-struct image *bmp_open(char *inbuf, int insize)
+static struct image *bmp_open(char *inbuf, int insize)
 {
 	struct image *img = calloc(1, sizeof(struct image));
 	struct bmp_image *bmp = (struct bmp_image*)inbuf;
@@ -30,7 +30,7 @@
 	return img;
 }
 
-void bmp_close(struct image *img)
+static void bmp_close(struct image *img)
 {
 	free(img->data);
 }