diff --git a/src/gamedata/d_dehacked.cpp b/src/gamedata/d_dehacked.cpp
index c7105117d..7156796db 100644
--- a/src/gamedata/d_dehacked.cpp
+++ b/src/gamedata/d_dehacked.cpp
@@ -282,6 +282,7 @@ static int PatchSize;
 static char *Line1, *Line2;
 static int	 dversion, pversion;
 static bool  including, includenotext;
+static int LumpFileNum;
 
 static const char *unknown_str = "Unknown key %s encountered in %s %d.\n";
 
@@ -2169,7 +2170,7 @@ static int PatchMusic (int dummy)
 		
 		keystring << "MUSIC_" << Line1;
 
-		TableElement te = { newname, newname, newname, newname };
+		TableElement te = { LumpFileNum, { newname, newname, newname, newname } };
 		DehStrings.Insert(keystring, te);
 		DPrintf (DMSG_SPAMMY, "Music %s set to:\n%s\n", keystring.GetChars(), newname.GetChars());
 	}
@@ -2285,7 +2286,7 @@ static int PatchText (int oldSize)
 		if (str != NULL)
 		{
 			FString newname = newStr;
-			TableElement te = { newname, newname, newname, newname };
+			TableElement te = { LumpFileNum, { newname, newname, newname, newname } };
 			DehStrings.Insert(str, te);
 			EnglishStrings.Remove(str);	// remove entry so that it won't get found again by the next iteration or  by another replacement later
 			good = true;
@@ -2340,7 +2341,7 @@ static int PatchStrings (int dummy)
 		// Account for a discrepancy between Boom's and ZDoom's name for the red skull key pickup message
 		const char *ll = Line1;
 		if (!stricmp(ll, "GOTREDSKULL")) ll = "GOTREDSKUL";
-		TableElement te = { holdstring, holdstring, holdstring, holdstring };
+		TableElement te = { LumpFileNum, { holdstring, holdstring, holdstring, holdstring } };
 		DehStrings.Insert(ll, te);
 		DPrintf (DMSG_SPAMMY, "%s set to:\n%s\n", Line1, holdstring.GetChars());
 	}
@@ -2496,13 +2497,19 @@ int D_LoadDehLumps(DehLumpSource source)
 
 bool D_LoadDehLump(int lumpnum)
 {
+	auto ls = LumpFileNum;
+	LumpFileNum = Wads.GetLumpFile(lumpnum);
+
 	PatchSize = Wads.LumpLength(lumpnum);
 
 	PatchName = copystring(Wads.GetLumpFullPath(lumpnum));
 	PatchFile = new char[PatchSize + 1];
 	Wads.ReadLump(lumpnum, PatchFile);
 	PatchFile[PatchSize] = '\0';		// terminate with a '\0' character
-	return DoDehPatch();
+	auto res = DoDehPatch();
+	LumpFileNum = ls;
+
+	return res;
 }
 
 bool D_LoadDehFile(const char *patchfile)
diff --git a/src/gamedata/stringtable.cpp b/src/gamedata/stringtable.cpp
index ea8fa074b..724951c22 100644
--- a/src/gamedata/stringtable.cpp
+++ b/src/gamedata/stringtable.cpp
@@ -67,8 +67,8 @@ void FStringTable::LoadStrings ()
 	{
 		auto lumpdata = Wads.ReadLumpIntoArray(lump);
 
-		if (!ParseLanguageCSV(lumpdata))
- 			LoadLanguage (lumpdata);
+		if (!ParseLanguageCSV(lump, lumpdata))
+ 			LoadLanguage (lump, lumpdata);
 	}
 	UpdateLanguage();
 	allMacros.Clear();
@@ -191,7 +191,7 @@ bool FStringTable::readMacros(int lumpnum)
 //
 //==========================================================================
 
-bool FStringTable::ParseLanguageCSV(const TArray<uint8_t> &buffer)
+bool FStringTable::ParseLanguageCSV(int lumpnum, const TArray<uint8_t> &buffer)
 {
 	if (memcmp(buffer.Data(), "default,", 8)) return false;
 	auto data = parseCSV(buffer);
@@ -199,6 +199,7 @@ bool FStringTable::ParseLanguageCSV(const TArray<uint8_t> &buffer)
 	int labelcol = -1;
 	int filtercol = -1;
 	TArray<std::pair<int, unsigned>> langrows;
+	bool hasDefaultEntry = false;
 
 	if (data.Size() > 0)
 	{
@@ -221,6 +222,7 @@ bool FStringTable::ParseLanguageCSV(const TArray<uint8_t> &buffer)
 					if (lang.CompareNoCase("default") == 0)
 					{
 						langrows.Push(std::make_pair(column, default_table));
+						hasDefaultEntry = true;
 					}
 					else if (lang.Len() < 4)
 					{
@@ -243,12 +245,16 @@ bool FStringTable::ParseLanguageCSV(const TArray<uint8_t> &buffer)
 			}
 
 			FName strName = row[labelcol];
+			if (hasDefaultEntry)
+			{
+				DeleteForLabel(lumpnum, strName);
+			}
 			for (auto &langentry : langrows)
 			{
 				auto str = row[langentry.first];
 				if (str.Len() > 0)
 				{
-					InsertString(langentry.second, strName, str);
+					InsertString(lumpnum, langentry.second, strName, str);
 				}
 				else
 				{
@@ -266,7 +272,7 @@ bool FStringTable::ParseLanguageCSV(const TArray<uint8_t> &buffer)
 //
 //==========================================================================
 
-void FStringTable::LoadLanguage (const TArray<uint8_t> &buffer)
+void FStringTable::LoadLanguage (int lumpnum, const TArray<uint8_t> &buffer)
 {
 	bool errordone = false;
 	TArray<uint32_t> activeMaps;
@@ -363,10 +369,14 @@ void FStringTable::LoadLanguage (const TArray<uint8_t> &buffer)
 			}
 			if (!skip)
 			{
+				if (activeMaps[0] == default_table)
+				{
+					DeleteForLabel(lumpnum, strName);
+				}
 				// Insert the string into all relevant tables.
 				for (auto map : activeMaps)
 				{
-					InsertString(map, strName, strText);
+					InsertString(lumpnum, map, strName, strText);
 				}
 			}
 		}
@@ -384,16 +394,40 @@ void FStringTable::DeleteString(int langid, FName label)
 	allStrings[langid].Remove(label);
 }
 
+//==========================================================================
+//
+// This deletes all older entries for a given label. This gets called
+// when a string in the default table gets updated. 
+//
+//==========================================================================
+
+void FStringTable::DeleteForLabel(int lumpnum, FName label)
+{
+	decltype(allStrings)::Iterator it(allStrings);
+	decltype(allStrings)::Pair *pair;
+	auto filenum = Wads.GetLumpFile(lumpnum);
+
+	while (it.NextPair(pair))
+	{
+		auto entry = pair->Value.CheckKey(label);
+		if (entry && entry->filenum < filenum)
+		{
+			pair->Value.Remove(label);
+		}
+	}
+
+}
+
 //==========================================================================
 //
 //
 //
 //==========================================================================
 
-void FStringTable::InsertString(int langid, FName label, const FString &string)
+void FStringTable::InsertString(int lumpnum, int langid, FName label, const FString &string)
 {
 	const char *strlangid = (const char *)&langid;
-	TableElement te = { string, string, string, string };
+	TableElement te = { lumpnum, { string, string, string, string } };
 	long index;
 	while ((index = te.strings[0].IndexOf("@[")) >= 0)
 	{
diff --git a/src/gamedata/stringtable.h b/src/gamedata/stringtable.h
index e96d29c58..37dac5553 100644
--- a/src/gamedata/stringtable.h
+++ b/src/gamedata/stringtable.h
@@ -49,6 +49,7 @@
 
 struct TableElement
 {
+	int filenum;
 	FString strings[4];
 };
 
@@ -104,14 +105,15 @@ private:
 	LangMap allStrings;
 	TArray<std::pair<uint32_t, StringMap*>> currentLanguageSet;
 
-	void LoadLanguage (const TArray<uint8_t> &buffer);
+	void LoadLanguage (int lumpnum, const TArray<uint8_t> &buffer);
 	TArray<TArray<FString>> parseCSV(const TArray<uint8_t> &buffer);
-	bool ParseLanguageCSV(const TArray<uint8_t> &buffer);
+	bool ParseLanguageCSV(int lumpnum, const TArray<uint8_t> &buffer);
 
 	bool LoadLanguageFromSpreadsheet(int lumpnum, const TArray<uint8_t> &buffer);
 	bool readMacros(int lumpnum);
-	void InsertString(int langid, FName label, const FString &string);
+	void InsertString(int lumpnum, int langid, FName label, const FString &string);
 	void DeleteString(int langid, FName label);
+	void DeleteForLabel(int lumpnum, FName label);
 
 	static size_t ProcessEscapes (char *str);
 };