diff --git a/src/maploader/maploader.cpp b/src/maploader/maploader.cpp
index 649ed04329..ad38081a90 100644
--- a/src/maploader/maploader.cpp
+++ b/src/maploader/maploader.cpp
@@ -103,7 +103,6 @@
 #include "fragglescript/t_fs.h"
 #include "maploader.h"
 
-sidei_t *sidetemp;
 TArray<FMapThing> MapThingsConverted;
 bool ForceNodeBuild;
 
@@ -1830,7 +1829,7 @@ void MapLoader::LoadLineDefs2 (MapData * map)
 	Level->sides.Alloc(count);
 	memset(&Level->sides[0], 0, count * sizeof(side_t));
 
-	sidetemp = new sidei_t[MAX<int>(count, Level->vertexes.Size())];
+	sidetemp.Resize(MAX<int>(count, Level->vertexes.Size()));
 	for (i = 0; i < count; i++)
 	{
 		sidetemp[i].a.special = sidetemp[i].a.tag = 0;
@@ -1857,12 +1856,8 @@ void MapLoader::LoopSidedefs (bool firstloop)
 {
 	int i;
 
-	if (sidetemp != nullptr)
-	{
-		delete[] sidetemp;
-	}
 	int numsides = Level->sides.Size();
-	sidetemp = new sidei_t[MAX<int>(Level->vertexes.Size(), numsides)];
+	sidetemp.Resize(MAX<int>(Level->vertexes.Size(), numsides));
 
 	for (i = 0; i < (int)Level->vertexes.Size(); ++i)
 	{
@@ -3231,8 +3226,4 @@ void MapLoader::LoadLevel(MapData *map, const char *lumpname, int position)
 	PO_Init();				// Initialize the polyobjs
 	if (!Level->IsReentering())
 		P_FinalizePortals();	// finalize line portals after polyobjects have been initialized. This info is needed for properly flagging them.
-
-	assert(sidetemp != nullptr);
-	delete[] sidetemp;
-	sidetemp = nullptr;
 }
diff --git a/src/maploader/maploader.h b/src/maploader/maploader.h
index 30e0e498eb..b9ed0f2f86 100644
--- a/src/maploader/maploader.h
+++ b/src/maploader/maploader.h
@@ -59,6 +59,27 @@ struct EDSector
 	double Overlayalpha[2];
 };
 
+struct sidei_t	// [RH] Only keep BOOM sidedef init stuff around for init
+{
+	union
+	{
+		// Used when unpacking sidedefs and assigning
+		// properties based on linedefs.
+		struct
+		{
+			short tag, special;
+			short alpha;
+			uint32_t map;
+		} a;
+
+		// Used when grouping sidedefs into loops.
+		struct
+		{
+			uint32_t first, next;
+			char lineside;
+		} b;
+	};
+};
 
 struct FMissingCount
 {
@@ -83,6 +104,7 @@ class MapLoader
 	TArray<FUDMFKey> MapThingsUserData;
 	int sidecount = 0;
 	TArray<int>		linemap;
+	TArray<sidei_t> sidetemp;
 
 	// Extradata loader
 	TMap<int, EDLinedef> EDLines;
diff --git a/src/maploader/polyobjects.cpp b/src/maploader/polyobjects.cpp
index 2bb54a969d..83ab246d77 100644
--- a/src/maploader/polyobjects.cpp
+++ b/src/maploader/polyobjects.cpp
@@ -117,7 +117,7 @@ void MapLoader::IterFindPolySides (FPolyObj *po, side_t *side)
 	static TArray<uint32_t> vnum;
 	unsigned int vnumat;
 
-	assert(sidetemp != NULL);
+	assert(sidetemp.Size() > 0);
 
 	vnum.Clear();
 	vnum.Push(uint32_t(side->V1()->Index()));
diff --git a/src/p_setup.h b/src/p_setup.h
index 1b237e657b..5973a4fcb2 100644
--- a/src/p_setup.h
+++ b/src/p_setup.h
@@ -170,28 +170,6 @@ void ReportUnpairedMinisegs();
 
 // To be moved to maploader later!
 
-struct sidei_t	// [RH] Only keep BOOM sidedef init stuff around for init
-{
-	union
-	{
-		// Used when unpacking sidedefs and assigning
-		// properties based on linedefs.
-		struct
-		{
-			short tag, special;
-			short alpha;
-			uint32_t map;
-		} a;
-
-		// Used when grouping sidedefs into loops.
-		struct
-		{
-			uint32_t first, next;
-			char lineside;
-		} b;
-	};
-};
-extern sidei_t *sidetemp;
 extern TArray<FMapThing> MapThingsConverted;
 extern bool ForceNodeBuild;