diff --git a/panda/src/pgraph/nodePath.cxx b/panda/src/pgraph/nodePath.cxx
index caea8ab2a9..775aa17f5b 100644
--- a/panda/src/pgraph/nodePath.cxx
+++ b/panda/src/pgraph/nodePath.cxx
@@ -3138,7 +3138,7 @@ get_texture(TextureStage *stage) const {
 //  Description: 
 ////////////////////////////////////////////////////////////////////
 void NodePath::
-set_shader(Shader *sha, int priority) {
+set_shader(const Shader *sha, int priority) {
   nassertv_always(!is_empty());
 
   const RenderAttrib *attrib =
diff --git a/panda/src/pgraph/nodePath.h b/panda/src/pgraph/nodePath.h
index 193225deb4..f2031bf3e8 100644
--- a/panda/src/pgraph/nodePath.h
+++ b/panda/src/pgraph/nodePath.h
@@ -564,7 +564,7 @@ PUBLISHED:
   Texture *get_texture() const;
   Texture *get_texture(TextureStage *stage) const;
 
-  void set_shader(Shader *sha, int priority = 0);
+  void set_shader(const Shader *sha, int priority = 0);
   void set_shader_off(int priority = 0);
   void clear_shader();
   void set_shader_input(const ShaderInput *inp);