diff --git a/lib/SILOptimizer/PassManager/PassPipeline.cpp b/lib/SILOptimizer/PassManager/PassPipeline.cpp
index 8d371c5..29bf614 100644
--- a/lib/SILOptimizer/PassManager/PassPipeline.cpp
+++ b/lib/SILOptimizer/PassManager/PassPipeline.cpp
@@ -29,6 +29,7 @@
 #include "swift/SILOptimizer/PassManager/Transforms.h"
 #include "swift/SILOptimizer/Utils/Local.h"
 #include "llvm/ADT/Statistic.h"
+#include "llvm/ADT/StringSwitch.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/ErrorOr.h"
diff --git a/validation-test/compiler_crashers/28578-result-case-not-implemented.swift b/validation-test/compiler_crashers/28578-result-case-not-implemented.swift
index 909b0ab..c889e9c 100644
--- a/validation-test/compiler_crashers/28578-result-case-not-implemented.swift
+++ b/validation-test/compiler_crashers/28578-result-case-not-implemented.swift
@@ -5,6 +5,7 @@
 // See https://swift.org/LICENSE.txt for license information
 // See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
 
+// REQUIRES: deterministic-behavior
 // RUN: not --crash %target-swift-frontend %s -emit-ir
 // REQUIRES: asserts
 {c:{a{}guard{return $0+1