diff --git a/src/p_mobj.cpp b/src/p_mobj.cpp
index 8c814738e..3d0d8e072 100644
--- a/src/p_mobj.cpp
+++ b/src/p_mobj.cpp
@@ -193,7 +193,7 @@ void AActor::Serialize (FArchive &arc)
 		<< Damage;
 	if (SaveVersion >= 4530)
 	{
-		arc << floorterrain;
+		P_SerializeTerrain(arc, floorterrain);
 	}
 	if (SaveVersion >= 3227)
 	{
diff --git a/src/p_saveg.cpp b/src/p_saveg.cpp
index 918eb7a89..db14aeb90 100644
--- a/src/p_saveg.cpp
+++ b/src/p_saveg.cpp
@@ -52,6 +52,7 @@
 #include "farchive.h"
 #include "p_lnspec.h"
 #include "p_acs.h"
+#include "p_terrain.h"
 
 static void CopyPlayer (player_t *dst, player_t *src, const char *name);
 static void ReadOnePlayer (FArchive &arc, bool skipload);
@@ -371,7 +372,8 @@ void P_SerializeWorld (FArchive &arc)
 			<< sec->gravity;
 		if (SaveVersion >= 4530)
 		{
-			arc << sec->terrainnum[0] << sec->terrainnum[1];
+			P_SerializeTerrain(arc, sec->terrainnum[0]);
+			P_SerializeTerrain(arc, sec->terrainnum[1]);
 		}
 		if (SaveVersion >= 4529)
 		{
diff --git a/src/p_terrain.cpp b/src/p_terrain.cpp
index 006835ea6..af8de5cab 100644
--- a/src/p_terrain.cpp
+++ b/src/p_terrain.cpp
@@ -46,6 +46,7 @@
 #include "s_sound.h"
 #include "p_local.h"
 #include "templates.h"
+#include "farchive.h"
 
 // MACROS ------------------------------------------------------------------
 
@@ -704,3 +705,26 @@ int P_FindTerrain (FName name)
 	}
 	return -1;
 }
+
+void P_SerializeTerrain(FArchive &arc, int &terrainnum)
+{
+	FName val;
+	if (arc.IsStoring())
+	{
+		if (terrainnum < 0 || terrainnum >= (int)Terrains.Size())
+		{
+			val = NAME_Null;
+		}
+		else
+		{
+			val = Terrains[terrainnum].Name;
+		}
+		arc << val;
+	}
+	else
+	{
+		arc << val;
+		terrainnum = P_FindTerrain(val);
+
+	}
+}
diff --git a/src/p_terrain.h b/src/p_terrain.h
index 85059a945..dab4904b6 100644
--- a/src/p_terrain.h
+++ b/src/p_terrain.h
@@ -122,6 +122,8 @@ struct FTerrainDef
 extern TArray<FSplashDef> Splashes;
 extern TArray<FTerrainDef> Terrains;
 
+class FArchive;
 int P_FindTerrain(FName name);
+void P_SerializeTerrain(FArchive &arc, int &terrainnum);
 
 #endif //__P_TERRAIN_H__