diff --git a/clang/test/CodeGenObjC/undefined-protocol.m b/clang/test/CodeGenObjC/undefined-protocol.m
index e5a72ab602f0..78cf8da336c3 100644
--- a/clang/test/CodeGenObjC/undefined-protocol.m
+++ b/clang/test/CodeGenObjC/undefined-protocol.m
@@ -1,5 +1,8 @@
 // RUN: %clang_cc1 -emit-llvm-only -fobjc-runtime=gcc %s
 
+// PR13820
+// REQUIRES: LP64
+
 @protocol MadeUpProtocol;
 
 @interface Object <MadeUpProtocol> @end
diff --git a/clang/test/Driver/objc++-cpp-output.mm b/clang/test/Driver/objc++-cpp-output.mm
index bb8814428ac4..9c4d55379ad1 100644
--- a/clang/test/Driver/objc++-cpp-output.mm
+++ b/clang/test/Driver/objc++-cpp-output.mm
@@ -1,5 +1,8 @@
 // RUN: %clang -x objc++-cpp-output -c %s -o /dev/null
 
+// PR13820
+// REQUIRES: LP64
+
 // Should compile without errors
 @protocol P
 - (void)m;
diff --git a/clang/test/Driver/objc-cpp-output.m b/clang/test/Driver/objc-cpp-output.m
index 6d974838c150..8c174f773205 100644
--- a/clang/test/Driver/objc-cpp-output.m
+++ b/clang/test/Driver/objc-cpp-output.m
@@ -1,5 +1,8 @@
 // RUN: %clang -x objc-cpp-output -c %s -o /dev/null
 
+// PR13820
+// REQUIRES: LP64
+
 // Should compile without errors
 @protocol P
 - (void)m;