diff --git a/clang/lib/CodeGen/BackendUtil.cpp b/clang/lib/CodeGen/BackendUtil.cpp
index 497652e..850b3db 100644
--- a/clang/lib/CodeGen/BackendUtil.cpp
+++ b/clang/lib/CodeGen/BackendUtil.cpp
@@ -231,9 +231,13 @@
     return true;
   case Triple::ELF:
     return CGOpts.DataSections && !CGOpts.DisableIntegratedAS;
-  default:
-    return false;
+  case Triple::XCOFF:
+    llvm::report_fatal_error("ASan not implemented for XCOFF.");
+  case Triple::Wasm:
+  case Triple::UnknownObjectFormat:
+    break;
   }
+  return false;
 }
 
 static void addAddressSanitizerPasses(const PassManagerBuilder &Builder,