diff --git a/include/swift/AST/Types.h b/include/swift/AST/Types.h
index e3fbbd4e742c2..e55c8bf7be3d5 100644
--- a/include/swift/AST/Types.h
+++ b/include/swift/AST/Types.h
@@ -4577,14 +4577,14 @@ class SILFunctionType final
                                     
   void Profile(llvm::FoldingSetNodeID &ID) {
     Profile(ID, getInvocationGenericSignature(),
-            getExtInfo(), getCoroutineKind(), getCalleeConvention(),
+            getExtInfo(), isAsync(), getCoroutineKind(), getCalleeConvention(),
             getParameters(), getYields(), getResults(),
             getOptionalErrorResult(), getWitnessMethodConformanceOrInvalid(),
             getPatternSubstitutions(), getInvocationSubstitutions());
   }
   static void
   Profile(llvm::FoldingSetNodeID &ID, GenericSignature genericSig, ExtInfo info,
-          SILCoroutineKind coroutineKind, ParameterConvention calleeConvention,
+          bool isAsync, SILCoroutineKind coroutineKind, ParameterConvention calleeConvention,
           ArrayRef<SILParameterInfo> params, ArrayRef<SILYieldInfo> yields,
           ArrayRef<SILResultInfo> results, Optional<SILResultInfo> errorResult,
           ProtocolConformanceRef conformance,
diff --git a/lib/AST/ASTContext.cpp b/lib/AST/ASTContext.cpp
index ef19cd4d46b31..e75c5185cc13b 100644
--- a/lib/AST/ASTContext.cpp
+++ b/lib/AST/ASTContext.cpp
@@ -3245,6 +3245,7 @@ void SILFunctionType::Profile(
     llvm::FoldingSetNodeID &id,
     GenericSignature genericParams,
     ExtInfo info,
+    bool isAsync,
     SILCoroutineKind coroutineKind,
     ParameterConvention calleeConvention,
     ArrayRef<SILParameterInfo> params,
@@ -3258,6 +3259,7 @@ void SILFunctionType::Profile(
   auto infoKey = info.getFuncAttrKey();
   id.AddInteger(infoKey.first);
   id.AddPointer(infoKey.second);
+  id.AddBoolean(isAsync);
   id.AddInteger(unsigned(coroutineKind));
   id.AddInteger(unsigned(calleeConvention));
   id.AddInteger(params.size());
@@ -3471,8 +3473,8 @@ CanSILFunctionType SILFunctionType::get(
   invocationSubs = invocationSubs.getCanonical();
   
   llvm::FoldingSetNodeID id;
-  SILFunctionType::Profile(id, genericSig, ext, coroutineKind, callee, params,
-                           yields, normalResults, errorResult,
+  SILFunctionType::Profile(id, genericSig, ext, isAsync, coroutineKind, callee,
+                           params, yields, normalResults, errorResult,
                            witnessMethodConformance,
                            patternSubs, invocationSubs);
 
diff --git a/test/SIL/Parser/async.sil b/test/SIL/Parser/async.sil
index 374572412f494..32cfdebb32c0f 100644
--- a/test/SIL/Parser/async.sil
+++ b/test/SIL/Parser/async.sil
@@ -1,5 +1,21 @@
 // RUN: %target-sil-opt -enable-sil-verify-all=true %s | %target-sil-opt -enable-sil-verify-all=true | %FileCheck %s
 
+import Builtin
+
+// CHECK: sil @not_async_test : $@convention(thin) () -> () {
+sil @not_async_test : $() -> () {
+bb0:
+  %0 = tuple ()
+  return %0 : $()
+}
+
+// CHECK: sil @not_async_test2 : $@convention(thin) (Builtin.Int32) -> () {
+sil @not_async_test2 : $(Builtin.Int32) -> () {
+bb0(%int : $Builtin.Int32):
+  %0 = tuple ()
+  return %0 : $()
+}
+
 // CHECK: sil @async_test : $@async
 sil @async_test : $@async () -> () {
 bb0: