diff --git a/gen/abi-ppc64.cpp b/gen/abi-ppc64.cpp
index fd13ea1a..d8f110ce 100644
--- a/gen/abi-ppc64.cpp
+++ b/gen/abi-ppc64.cpp
@@ -29,10 +29,9 @@ struct PPC64TargetABI : TargetABI {
         case LINKintrinsic:
         case LINKpascal:
         case LINKwindows:
-            return llvm::CallingConv::C;
         case LINKd:
         case LINKdefault:
-            return llvm::CallingConv::Fast;
+            return llvm::CallingConv::C;
         default:
             llvm_unreachable("Unhandled D linkage type.");
         }