diff --git a/src/common/filesystem/filesystem.cpp b/src/common/filesystem/filesystem.cpp
index ff991d8b8..4afb284e1 100644
--- a/src/common/filesystem/filesystem.cpp
+++ b/src/common/filesystem/filesystem.cpp
@@ -47,8 +47,6 @@
 #include "printf.h"
 #include "md5.h"
 
-extern	FILE* hashfile;
-
 // MACROS ------------------------------------------------------------------
 
 #define NULL_INDEX		(0xffffffff)
@@ -208,7 +206,7 @@ void FileSystem::InitSingleFile(const char* filename, bool quiet)
 	InitMultipleFiles(filenames, true);
 }
 
-void FileSystem::InitMultipleFiles (TArray<FString> &filenames, bool quiet, LumpFilterInfo* filter, bool allowduplicates)
+void FileSystem::InitMultipleFiles (TArray<FString> &filenames, bool quiet, LumpFilterInfo* filter, bool allowduplicates, FILE* hashfile)
 {
 	int numfiles;
 
@@ -234,7 +232,7 @@ void FileSystem::InitMultipleFiles (TArray<FString> &filenames, bool quiet, Lump
 
 	for(unsigned i=0;i<filenames.Size(); i++)
 	{
-		AddFile (filenames[i], nullptr, quiet, filter);
+		AddFile (filenames[i], nullptr, quiet, filter, hashfile);
 
 		if (i == (unsigned)MaxIwadIndex) MoveLumpsInFolder("after_iwad/");
 		FStringf path("filter/%s", Files.Last()->GetHash().GetChars());
@@ -310,7 +308,7 @@ int FileSystem::AddFromBuffer(const char* name, const char* type, char* data, in
 // [RH] Removed reload hack
 //==========================================================================
 
-void FileSystem::AddFile (const char *filename, FileReader *filer, bool quiet, LumpFilterInfo* filter)
+void FileSystem::AddFile (const char *filename, FileReader *filer, bool quiet, LumpFilterInfo* filter, FILE* hashfile)
 {
 	int startlump;
 	bool isdir = false;
@@ -378,7 +376,7 @@ void FileSystem::AddFile (const char *filename, FileReader *filer, bool quiet, L
 				FString path;
 				path.Format("%s:%s", filename, lump->getName());
 				auto embedded = lump->NewReader();
-				AddFile(path, &embedded, quiet, filter);
+				AddFile(path, &embedded, quiet, filter, hashfile);
 			}
 		}
 
diff --git a/src/common/filesystem/filesystem.h b/src/common/filesystem/filesystem.h
index 4052a7f4c..2dc80f7ff 100644
--- a/src/common/filesystem/filesystem.h
+++ b/src/common/filesystem/filesystem.h
@@ -68,8 +68,8 @@ public:
 	void SetMaxIwadNum(int x) { MaxIwadIndex = x; }
 
 	void InitSingleFile(const char *filename, bool quiet = false);
-	void InitMultipleFiles (TArray<FString> &filenames, bool quiet = false, LumpFilterInfo* filter = nullptr, bool allowduplicates = false);
-	void AddFile (const char *filename, FileReader *wadinfo, bool quiet, LumpFilterInfo* filter);
+	void InitMultipleFiles (TArray<FString> &filenames, bool quiet = false, LumpFilterInfo* filter = nullptr, bool allowduplicates = false, FILE* hashfile = nullptr);
+	void AddFile (const char *filename, FileReader *wadinfo, bool quiet, LumpFilterInfo* filter, FILE* hashfile);
 	int CheckIfResourceFileLoaded (const char *name) noexcept;
 	void AddAdditionalFile(const char* filename, FileReader* wadinfo = NULL) {}
 
diff --git a/src/d_main.cpp b/src/d_main.cpp
index a47f1cf2f..a7d3d2382 100644
--- a/src/d_main.cpp
+++ b/src/d_main.cpp
@@ -317,7 +317,6 @@ FString startmap;
 bool autostart;
 bool advancedemo;
 FILE *debugfile;
-FILE *hashfile;
 gamestate_t wipegamestate = GS_DEMOSCREEN;	// can be -1 to force a wipe
 bool PageBlank;
 FGameTexture *Advisory;
@@ -2954,6 +2953,39 @@ static void System_SetTransition(int type)
 
 bool  CheckSkipGameOptionBlock(const char* str);
 
+//==========================================================================
+//
+//
+//
+//==========================================================================
+
+static FILE* D_GetHashFile()
+{
+	FILE *hashfile = nullptr;
+
+	if (Args->CheckParm("-hashfiles"))
+	{
+		const char *filename = "fileinfo.txt";
+		Printf("Hashing loaded content to: %s\n", filename);
+		hashfile = fopen(filename, "w");
+		if (hashfile)
+		{
+			Printf("Notice: File hashing is incredibly verbose. Expect loading files to take much longer than usual.\n");
+			fprintf(hashfile, "%s version %s (%s)\n", GAMENAME, GetVersionString(), GetGitHash());
+#ifdef __VERSION__
+			fprintf(hashfile, "Compiler version: %s\n", __VERSION__);
+#endif
+			fprintf(hashfile, "Command line:");
+			for (int i = 0; i < Args->NumArgs(); ++i)
+			{
+				fprintf(hashfile, " %s", Args->GetArg(i));
+			}
+			fprintf(hashfile, "\n");
+		}
+	}
+	return hashfile;
+}
+
 //==========================================================================
 //
 // D_InitGame
@@ -2994,11 +3026,6 @@ static int D_InitGame(const FIWADInfo* iwad_info, TArray<FString> allwads)
 		exec->AddPullins(allwads, GameConfig);
 	}
 
-	if (hashfile)
-	{
-		Printf("Notice: File hashing is incredibly verbose. Expect loading files to take much longer than usual.\n");
-	}
-
 	if (!batchrun) Printf ("W_Init: Init WADfiles.\n");
 
 	LumpFilterInfo lfi;
@@ -3030,7 +3057,8 @@ static int D_InitGame(const FIWADInfo* iwad_info, TArray<FString> allwads)
 	};
 
 	bool allowduplicates = Args->CheckParm("-allowduplicates");
-	fileSystem.InitMultipleFiles (allwads, false, &lfi, allowduplicates);
+	auto hashfile = D_GetHashFile();
+	fileSystem.InitMultipleFiles (allwads, false, &lfi, allowduplicates, hashfile);
 	allwads.Clear();
 	allwads.ShrinkToFit();
 	SetMapxxFlag();
@@ -3468,26 +3496,6 @@ static int D_DoomMain_Internal (void)
 		Printf("\n");
 	}
 
-	if (Args->CheckParm("-hashfiles"))
-	{
-		const char *filename = "fileinfo.txt";
-		Printf("Hashing loaded content to: %s\n", filename);
-		hashfile = fopen(filename, "w");
-		if (hashfile)
-		{
-			fprintf(hashfile, "%s version %s (%s)\n", GAMENAME, GetVersionString(), GetGitHash());
-#ifdef __VERSION__
-			fprintf(hashfile, "Compiler version: %s\n", __VERSION__);
-#endif
-			fprintf(hashfile, "Command line:");
-			for (int i = 0; i < Args->NumArgs(); ++i)
-			{
-				fprintf(hashfile, " %s", Args->GetArg(i));
-			}
-			fprintf(hashfile, "\n");
-		}
-	}
-
 	if (!batchrun) Printf(PRINT_LOG, "%s version %s\n", GAMENAME, GetVersionString());
 
 	D_DoomInit();