diff --git a/src/mesa/program/prog_parameter.h b/src/mesa/program/prog_parameter.h
index 0457a0d874d..3ee5e349dfc 100644
--- a/src/mesa/program/prog_parameter.h
+++ b/src/mesa/program/prog_parameter.h
@@ -204,7 +204,7 @@ _mesa_add_sized_state_reference(struct gl_program_parameter_list *paramList,
 
 extern GLint
 _mesa_add_state_reference(struct gl_program_parameter_list *paramList,
-                          const gl_state_index16 stateTokens[]);
+                          const gl_state_index16 stateTokens[STATE_LENGTH]);
 
 
 static inline GLint