diff --git a/runtime/vm/compiler/stub_code_compiler.cc b/runtime/vm/compiler/stub_code_compiler.cc
index 584edce98e1..f561a72b383 100644
--- a/runtime/vm/compiler/stub_code_compiler.cc
+++ b/runtime/vm/compiler/stub_code_compiler.cc
@@ -3345,7 +3345,8 @@ void StubCodeCompiler::GenerateSubtypeTestCacheSearch(
           ZERO, (n >= 5) ? &load_function_type_arguments : &initialized);
       __ ExtractBitField(
           instance_type_args_reg, TypeTestABI::kScratchReg,
-          UntaggedClosure::InstantiatorTypeArgumentsIndexBits::shift(),
+          UntaggedClosure::InstantiatorTypeArgumentsIndexBits::shift() +
+              kSmiTagShift,
           UntaggedClosure::InstantiatorTypeArgumentsIndexBits::bitsize());
       __ LoadIndexedCompressed(
           instance_type_args_reg, TypeTestABI::kInstanceReg,
@@ -3360,7 +3361,8 @@ void StubCodeCompiler::GenerateSubtypeTestCacheSearch(
             (n >= 6) ? &load_delayed_type_arguments : &initialized);
         __ ExtractBitField(
             parent_fun_type_args_reg, TypeTestABI::kScratchReg,
-            UntaggedClosure::FunctionTypeArgumentsIndexBits::shift(),
+            UntaggedClosure::FunctionTypeArgumentsIndexBits::shift() +
+                kSmiTagShift,
             UntaggedClosure::FunctionTypeArgumentsIndexBits::bitsize());
         __ LoadIndexedCompressed(
             parent_fun_type_args_reg, TypeTestABI::kInstanceReg,
diff --git a/runtime/vm/compiler/stub_code_compiler_ia32.cc b/runtime/vm/compiler/stub_code_compiler_ia32.cc
index ac5418ebc09..884e4eba663 100644
--- a/runtime/vm/compiler/stub_code_compiler_ia32.cc
+++ b/runtime/vm/compiler/stub_code_compiler_ia32.cc
@@ -2795,7 +2795,8 @@ void StubCodeCompiler::GenerateSubtypeNTestCacheStub(Assembler* assembler,
       __ ExtractBitField(
           STCInternal::kInstanceInstantiatorTypeArgumentsReg,
           STCInternal::kScratchReg,
-          UntaggedClosure::InstantiatorTypeArgumentsIndexBits::shift(),
+          UntaggedClosure::InstantiatorTypeArgumentsIndexBits::shift() +
+              kSmiTagShift,
           UntaggedClosure::InstantiatorTypeArgumentsIndexBits::bitsize());
       __ Load(
           STCInternal::kInstanceInstantiatorTypeArgumentsReg,
@@ -2812,7 +2813,8 @@ void StubCodeCompiler::GenerateSubtypeNTestCacheStub(Assembler* assembler,
             &no_function_type_arguments);
         __ ExtractBitField(
             STCInternal::kScratchReg, STCInternal::kScratchReg,
-            UntaggedClosure::FunctionTypeArgumentsIndexBits::shift(),
+            UntaggedClosure::FunctionTypeArgumentsIndexBits::shift() +
+                kSmiTagShift,
             UntaggedClosure::FunctionTypeArgumentsIndexBits::bitsize());
         __ pushl(FieldAddress(TypeTestABI::kInstanceReg,
                               STCInternal::kScratchReg, TIMES_WORD_SIZE,