diff --git a/test/IRGen/debug_fragment_merge.sil b/test/IRGen/debug_fragment_merge.sil
index e794007d99bb8..b27338916d439 100644
--- a/test/IRGen/debug_fragment_merge.sil
+++ b/test/IRGen/debug_fragment_merge.sil
@@ -1,5 +1,10 @@
 // RUN: %target-swift-frontend -disable-availability-checking -primary-file %s -emit-ir -disable-llvm-optzns -O -g | %FileCheck %s
 
+// Checking the below on 32 bit architectures would be cumbersome: each
+// fragment is 32 bits long, which changes the number of checks as well as the
+// arithmethic on the bounds of each fragment.
+// UNSUPPORTED: OS=watchos
+
 // CHECK-DAG: llvm.dbg.value{{.*}} metadata ![[VAR:[0-9]+]], metadata !DIExpression(DW_OP_LLVM_fragment, 192, 64){{.*}} !dbg ![[LOC1:[0-9]+]]
 // CHECK-DAG: llvm.dbg.value{{.*}} metadata ![[VAR]], metadata !DIExpression(DW_OP_LLVM_fragment, 128, 64){{.*}} !dbg ![[LOC1]]
 // CHECK-DAG: llvm.dbg.value{{.*}} metadata ![[VAR]], metadata !DIExpression(DW_OP_LLVM_fragment, 64, 64){{.*}} !dbg ![[LOC1]]
diff --git a/test/IRGen/debug_fragment_merge.swift b/test/IRGen/debug_fragment_merge.swift
index ae373691ac62f..b7663b5c2915e 100644
--- a/test/IRGen/debug_fragment_merge.swift
+++ b/test/IRGen/debug_fragment_merge.swift
@@ -1,6 +1,8 @@
 // RUN: %target-swift-frontend -disable-availability-checking -primary-file %s -emit-sil -O -g | %FileCheck %s --check-prefix CHECK-SIL
 // RUN: %target-swift-frontend -disable-availability-checking -primary-file %s -emit-ir -disable-llvm-optzns -O -g | %FileCheck %s
 
+// UNSUPPORTED: OS=watchos
+
 protocol External {
   func use(str: String);
   func decode<T>(_: T.Type) -> T