diff --git a/runtime/src/main/cpp/Memory.cpp b/runtime/src/main/cpp/Memory.cpp
index 882328e77af..61136f7b1b5 100644
--- a/runtime/src/main/cpp/Memory.cpp
+++ b/runtime/src/main/cpp/Memory.cpp
@@ -101,7 +101,7 @@ ObjHeader* AllocStringInstance(
 
 ObjHeader* InitInstance(
     ObjHeader** location, const TypeInfo* type_info, PlacementHint hint,
-    void (*ctor)(ObjHeader*)) {
+    ObjHeader* (*ctor)(ObjHeader*)) {
   ObjHeader* sentinel = reinterpret_cast<ObjHeader*>(1);
   ObjHeader* value;
   // Wait until other initializers.
diff --git a/runtime/src/main/cpp/Memory.h b/runtime/src/main/cpp/Memory.h
index 51455522ce1..1b8275cd4b5 100644
--- a/runtime/src/main/cpp/Memory.h
+++ b/runtime/src/main/cpp/Memory.h
@@ -258,7 +258,7 @@ ObjHeader* AllocStringInstance(PlacementHint hint,
                                  const char* data, uint32_t length);
 ObjHeader* InitInstance(
     ObjHeader** location, const TypeInfo* type_info, PlacementHint hint,
-    void (*ctor)(ObjHeader*));
+    ObjHeader* (*ctor)(ObjHeader*));
 
 #ifdef __cplusplus
 }