diff --git a/src/g_game.cpp b/src/g_game.cpp
index 5d1f83b82..629202ea5 100644
--- a/src/g_game.cpp
+++ b/src/g_game.cpp
@@ -1884,7 +1884,7 @@ void G_DoLoadGame ()
 			}
 			else
 			{
-				Printf("Savegame is from another ZDoom-based engine: %s\n", engine);
+				Printf("Savegame is from another ZDoom-based engine: %s\n", engine.GetChars());
 			}
 			delete resfile;
 			return;
@@ -2261,7 +2261,7 @@ void G_DoSaveGame (bool okForQuicksave, FString filename, const char *descriptio
 	}
 
 	auto picdata = savepic.GetBuffer();
-	FCompressedBuffer bufpng = { picdata->Size(), picdata->Size(), METHOD_STORED, 0, crc32(0, &(*picdata)[0], picdata->Size()), (char*)&(*picdata)[0] };
+	FCompressedBuffer bufpng = { picdata->Size(), picdata->Size(), METHOD_STORED, 0, static_cast<unsigned int>(crc32(0, &(*picdata)[0], picdata->Size())), (char*)&(*picdata)[0] };
 
 	savegame_content.Push(bufpng);
 	savegame_filenames.Push("savepic.png");
diff --git a/src/serializer.cpp b/src/serializer.cpp
index ae1c55a7a..a23459ced 100644
--- a/src/serializer.cpp
+++ b/src/serializer.cpp
@@ -859,7 +859,7 @@ void FSerializer::ReadObjects(bool hubtravel)
 					PClass *cls = PClass::FindClass(clsname);
 					if (cls == nullptr)
 					{
-						Printf("Unknown object class '%d' in savegame", clsname.GetChars());
+						Printf("Unknown object class '%s' in savegame", clsname.GetChars());
 						founderrors = true;
 						r->mDObjects[i] = RUNTIME_CLASS(AActor)->CreateNew();	// make sure we got at least a valid pointer for the duration of the loading process.
 						r->mDObjects[i]->Destroy();								// but we do not want to keep this around, so destroy it right away.
diff --git a/src/serializer.h b/src/serializer.h
index f1d35e1f8..a3e1f531e 100644
--- a/src/serializer.h
+++ b/src/serializer.h
@@ -163,7 +163,7 @@ public:
 	template<class T>
 	FSerializer &Enum(const char *key, T &obj)
 	{
-		auto val = (std::underlying_type<T>::type)obj;
+		auto val = (typename std::underlying_type<T>::type)obj;
 		Serialize(*this, key, val, nullptr);
 		obj = (T)val;
 		return *this;
@@ -299,4 +299,4 @@ FSerializer &Serialize(FSerializer &arc, const char *key, TFlags<T, TT> &flags,
 }
 
 
-#endif
\ No newline at end of file
+#endif