diff --git a/src/interpreter/interpreter.cpp b/src/interpreter/interpreter.cpp
index 42a83f73786..07f69509b3f 100644
--- a/src/interpreter/interpreter.cpp
+++ b/src/interpreter/interpreter.cpp
@@ -97,6 +97,9 @@ struct ExpressionInterpreter : OverriddenVisitor<ExpressionInterpreter, Flow> {
     } else if (curr->op == SubInt32) {
       push(lhs.sub(rhs));
       return {};
+    } else if (curr->op == MulInt32) {
+      push(lhs.mul(rhs));
+      return {};
     }
     WASM_UNREACHABLE("TODO");
   }
diff --git a/test/gtest/interpreter.cpp b/test/gtest/interpreter.cpp
index 399d46912e9..418d61530a7 100644
--- a/test/gtest/interpreter.cpp
+++ b/test/gtest/interpreter.cpp
@@ -58,3 +58,20 @@ TEST(InterpreterTest, SubI32) {
 
   EXPECT_EQ(results, expected);
 }
+
+TEST(InterpreterTest, MulI32) {
+  Module wasm;
+  IRBuilder builder(wasm);
+
+  ASSERT_FALSE(builder.makeConst(Literal(uint32_t(1))).getErr());
+  ASSERT_FALSE(builder.makeConst(Literal(uint32_t(2))).getErr());
+  ASSERT_FALSE(builder.makeBinary(MulInt32).getErr());
+
+  auto expr = builder.build();
+  ASSERT_FALSE(expr.getErr());
+
+  auto results = Interpreter{}.run(*expr);
+  std::vector<Literal> expected{Literal(uint32_t(2))};
+
+  EXPECT_EQ(results, expected);
+}