diff --git a/src/asmjs/asm-parser.cc b/src/asmjs/asm-parser.cc
index f0c535ed8b..0fbc238613 100644
--- a/src/asmjs/asm-parser.cc
+++ b/src/asmjs/asm-parser.cc
@@ -1642,6 +1642,7 @@ AsmType* AsmJsParser::UnaryExpression() {
 
 // 6.8.8 MultiplicativeExpression
 AsmType* AsmJsParser::MultiplicativeExpression() {
+  AsmType* a;
   uint32_t uvalue;
   if (CheckForUnsignedBelow(0x100000, &uvalue)) {
     if (Check('*')) {
@@ -1654,8 +1655,10 @@ AsmType* AsmJsParser::MultiplicativeExpression() {
       current_function_builder_->EmitI32Const(value);
       current_function_builder_->Emit(kExprI32Mul);
       return AsmType::Intish();
+    } else {
+      scanner_.Rewind();
+      RECURSEn(a = UnaryExpression());
     }
-    scanner_.Rewind();
   } else if (Check('-')) {
     if (CheckForUnsignedBelow(0x100000, &uvalue)) {
       int32_t value = -static_cast<int32_t>(uvalue);
@@ -1669,12 +1672,14 @@ AsmType* AsmJsParser::MultiplicativeExpression() {
         current_function_builder_->Emit(kExprI32Mul);
         return AsmType::Intish();
       }
-      return AsmType::Signed();
+      a = AsmType::Signed();
+    } else {
+      scanner_.Rewind();
+      RECURSEn(a = UnaryExpression());
     }
-    scanner_.Rewind();
+  } else {
+    RECURSEn(a = UnaryExpression());
   }
-  AsmType* a;
-  RECURSEn(a = UnaryExpression());
   for (;;) {
     if (Check('*')) {
       uint32_t uvalue;
diff --git a/test/mjsunit/regress/regress-8377.js b/test/mjsunit/regress/regress-8377.js
new file mode 100644
index 0000000000..32d2eb74fb
--- /dev/null
+++ b/test/mjsunit/regress/regress-8377.js
@@ -0,0 +1,24 @@
+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --allow-natives-syntax
+
+function Module(global, env, buffer) {
+  "use asm";
+  function test1() {
+    var x = 0;
+    x = -1 / 1 | 0;
+    return x | 0;
+  }
+  function test2() {
+    var x = 0;
+    x = (-1 / 1) | 0;
+    return x | 0;
+  }
+  return { test1: test1, test2: test2 };
+};
+let module = Module(this);
+assertEquals(-1, module.test1());
+assertEquals(-1, module.test2());
+assertTrue(%IsAsmWasmCode(Module));