diff --git a/src/glsl/lower_variable_index_to_cond_assign.cpp b/src/glsl/lower_variable_index_to_cond_assign.cpp
index 2044199d27b..68f30ca0ef8 100644
--- a/src/glsl/lower_variable_index_to_cond_assign.cpp
+++ b/src/glsl/lower_variable_index_to_cond_assign.cpp
@@ -258,6 +258,7 @@ public:
       }
 
       assert(!"Should not get here.");
+      return false;
    }
 
    ir_variable *convert_dereference_array(ir_dereference_array *orig_deref,