diff --git a/gdk/gdkgl.c b/gdk/gdkgl.c
index 17a3a89d2a..3b843f15ca 100644
--- a/gdk/gdkgl.c
+++ b/gdk/gdkgl.c
@@ -50,7 +50,7 @@ get_vertex_type_name (int type)
   return "unknown";
 }
 
-guint
+static guint
 create_shader (int type, const char const *code)
 {
   guint shader;
@@ -82,7 +82,7 @@ create_shader (int type, const char const *code)
   return shader;
 }
 
-guint
+static guint
 make_program (const char const *vertex_shader_code, const char const *fragment_shader_code)
 {
   guint program, vertex_shader, fragment_shader;