diff --git a/gen/functions.cpp b/gen/functions.cpp
index cccb84e6..6c9ecd7a 100644
--- a/gen/functions.cpp
+++ b/gen/functions.cpp
@@ -256,15 +256,15 @@ llvm::FunctionType* DtoFunctionType(Type* type, IrFuncTy &irFty, Type* thistype,
         lidx++;
     }
 
-    // Now we can modify irFty safely.
-    irFty = newIrFty;
-
     // let the abi rewrite the types as necesary
-    abi->rewriteFunctionType(f, irFty);
+    abi->rewriteFunctionType(f, newIrFty);
 
     // Tell the ABI we're done with this function type
     abi->doneWithFunctionType();
 
+    // Now we can modify irFty safely.
+    irFty = llvm_move(newIrFty);
+
     // build the function type
     std::vector<LLType*> argtypes;
     argtypes.reserve(lidx);
diff --git a/gen/llvmcompat.h b/gen/llvmcompat.h
index 6435153b..f84e93dc 100644
--- a/gen/llvmcompat.h
+++ b/gen/llvmcompat.h
@@ -32,4 +32,8 @@
 #define HAS_ATTRIBUTES(x) (x)
 #endif
 
+#if LDC_LLVM_VER < 302
+#define llvm_move(value) (value)
+#endif
+
 #endif