diff --git a/llvm/lib/Target/WebAssembly/InstPrinter/WebAssemblyInstPrinter.cpp b/llvm/lib/Target/WebAssembly/InstPrinter/WebAssemblyInstPrinter.cpp
index c040c81..99c8146 100644
--- a/llvm/lib/Target/WebAssembly/InstPrinter/WebAssemblyInstPrinter.cpp
+++ b/llvm/lib/Target/WebAssembly/InstPrinter/WebAssemblyInstPrinter.cpp
@@ -73,20 +73,24 @@
     switch (MI->getOpcode()) {
     default:
       break;
-    case WebAssembly::LOOP: {
+    case WebAssembly::LOOP:
+    case WebAssembly::LOOP_S: {
       printAnnotation(OS, "label" + utostr(ControlFlowCounter) + ':');
       ControlFlowStack.push_back(std::make_pair(ControlFlowCounter++, true));
       break;
     }
     case WebAssembly::BLOCK:
+    case WebAssembly::BLOCK_S:
       ControlFlowStack.push_back(std::make_pair(ControlFlowCounter++, false));
       break;
     case WebAssembly::END_LOOP:
+    case WebAssembly::END_LOOP_S:
       // Have to guard against an empty stack, in case of mismatched pairs
       // in assembly parsing.
       if (!ControlFlowStack.empty()) ControlFlowStack.pop_back();
       break;
     case WebAssembly::END_BLOCK:
+    case WebAssembly::END_BLOCK_S:
       if (!ControlFlowStack.empty()) printAnnotation(
           OS, "label" + utostr(ControlFlowStack.pop_back_val().first) + ':');
       break;