diff --git a/dlls/wined3d/glsl_shader.c b/dlls/wined3d/glsl_shader.c
index 55affc17bbf..719c8a2eaa7 100644
--- a/dlls/wined3d/glsl_shader.c
+++ b/dlls/wined3d/glsl_shader.c
@@ -9062,7 +9062,7 @@ static void glsl_vertex_pipe_shademode(struct wined3d_context *context,
     context->shader_update_mask |= 1 << WINED3D_SHADER_TYPE_VERTEX;
 }
 
-void glsl_vertex_pipe_clip_plane(struct wined3d_context *context,
+static void glsl_vertex_pipe_clip_plane(struct wined3d_context *context,
         const struct wined3d_state *state, DWORD state_id)
 {
     const struct wined3d_gl_info *gl_info = context->gl_info;