diff --git a/src/compiler/glsl/ir_optimization.h b/src/compiler/glsl/ir_optimization.h
index 93fa3c7a9d4..e46d038fd50 100644
--- a/src/compiler/glsl/ir_optimization.h
+++ b/src/compiler/glsl/ir_optimization.h
@@ -81,10 +81,6 @@ bool propagate_invariance(exec_list *instructions);
 
 namespace ir_builder { class ir_factory; };
 
-ir_variable *compare_index_block(ir_builder::ir_factory &body,
-                                 ir_variable *index,
-                                 unsigned base, unsigned components);
-
 bool lower_64bit_integer_instructions(exec_list *instructions,
                                       unsigned what_to_lower);