diff --git a/src/compiler/glsl/ir_constant_expression.cpp b/src/compiler/glsl/ir_constant_expression.cpp
index a9613b256b1..2664fefbc45 100644
--- a/src/compiler/glsl/ir_constant_expression.cpp
+++ b/src/compiler/glsl/ir_constant_expression.cpp
@@ -1726,6 +1726,9 @@ ir_expression::constant_expression_value(struct hash_table *variable_context)
          case GLSL_TYPE_DOUBLE:
             data.d[c] = op[c]->value.d[0];
             break;
+         case GLSL_TYPE_BOOL:
+            data.b[c] = op[c]->value.b[0];
+            break;
          default:
             assert(0);
          }