diff --git a/src/mips/macro-assembler-mips.cc b/src/mips/macro-assembler-mips.cc
index bf222221f0..361a30f218 100644
--- a/src/mips/macro-assembler-mips.cc
+++ b/src/mips/macro-assembler-mips.cc
@@ -5054,6 +5054,9 @@ void MacroAssembler::AssertGeneratorObject(Register object) {
   // Check if JSGeneratorObject
   Branch(&done, eq, t8, Operand(JS_GENERATOR_OBJECT_TYPE));
 
+  // Check if JSAsyncFunctionObject (See MacroAssembler::CompareInstanceType)
+  Branch(&done, eq, t8, Operand(JS_ASYNC_FUNCTION_OBJECT_TYPE));
+
   // Check if JSAsyncGeneratorObject
   Branch(&done, eq, t8, Operand(JS_ASYNC_GENERATOR_OBJECT_TYPE));
 
diff --git a/src/mips64/macro-assembler-mips64.cc b/src/mips64/macro-assembler-mips64.cc
index ef0e67d39c..8d7ede22fd 100644
--- a/src/mips64/macro-assembler-mips64.cc
+++ b/src/mips64/macro-assembler-mips64.cc
@@ -5422,6 +5422,9 @@ void MacroAssembler::AssertGeneratorObject(Register object) {
   // Check if JSGeneratorObject
   Branch(&done, eq, t8, Operand(JS_GENERATOR_OBJECT_TYPE));
 
+  // Check if JSAsyncFunctionObject (See MacroAssembler::CompareInstanceType)
+  Branch(&done, eq, t8, Operand(JS_ASYNC_FUNCTION_OBJECT_TYPE));
+
   // Check if JSAsyncGeneratorObject
   Branch(&done, eq, t8, Operand(JS_ASYNC_GENERATOR_OBJECT_TYPE));