diff --git a/src/engine/shared/map.cpp b/src/engine/shared/map.cpp
index d38bab669..ad63e6fd5 100644
--- a/src/engine/shared/map.cpp
+++ b/src/engine/shared/map.cpp
@@ -55,14 +55,24 @@ public:
 					
 					if(pTilemap->m_Version > 3)
 					{
-						CTile *pTiles = static_cast<CTile *>(mem_alloc(pTilemap->m_Width * pTilemap->m_Height * sizeof(CTile), 1));
+						const int TilemapCount = pTilemap->m_Width * pTilemap->m_Height;
+						const int TilemapSize = TilemapCount * sizeof(CTile);
+
+						if((TilemapCount / pTilemap->m_Width != pTilemap->m_Height) || (TilemapSize / sizeof(CTile) != TilemapCount))
+						{
+							dbg_msg("engine", "map layer too big (%d * %d * %d causes an integer overflow)", pTilemap->m_Width, pTilemap->m_Height, sizeof(CTile));
+							return false;
+						}
+						CTile *pTiles = static_cast<CTile *>(mem_alloc(TilemapSize, 1));
+						if(!pTiles)
+							return false;
 
 						// extract original tile data
 						int i = 0;
 						CTile *pSavedTiles = static_cast<CTile *>(m_DataFile.GetData(pTilemap->m_Data));
-						while(i < pTilemap->m_Width * pTilemap->m_Height)
+						while(i < TilemapCount)
 						{
-							for(unsigned Counter = 0; Counter <= pSavedTiles->m_Skip && i < pTilemap->m_Width * pTilemap->m_Height; Counter++)
+							for(unsigned Counter = 0; Counter <= pSavedTiles->m_Skip && i < TilemapCount; Counter++)
 							{
 								pTiles[i] = *pSavedTiles;
 								pTiles[i++].m_Skip = 0;