diff --git a/lib/CodeGen/CodeGenFunction.cpp b/lib/CodeGen/CodeGenFunction.cpp
index ca59dc4..09d49c9 100644
--- a/lib/CodeGen/CodeGenFunction.cpp
+++ b/lib/CodeGen/CodeGenFunction.cpp
@@ -174,7 +174,7 @@
 
   auto mergeFnAttrValue = [&](StringRef Name, bool Value) {
     auto OldValue =
-        CGF.CurFn->getFnAttribute(Name).getValueAsString() == "true";
+        CGF.CurFn->getFnAttribute(Name).getValueAsBool();
     auto NewValue = OldValue & Value;
     if (OldValue != NewValue)
       CGF.CurFn->addFnAttr(Name, llvm::toStringRef(NewValue));