diff --git a/TileEngine/worlddef.cpp b/TileEngine/worlddef.cpp
index d51f70d88..6705b2950 100644
--- a/TileEngine/worlddef.cpp
+++ b/TileEngine/worlddef.cpp
@@ -4636,6 +4636,7 @@ void SetWorldSize(INT32 nWorldRows, INT32 nWorldCols)
 	if(gubFOVDebugInfoInfo)
 		MemFree(gubFOVDebugInfoInfo);
 	gubFOVDebugInfoInfo = (UINT8*)MemAlloc(WORLD_MAX);
+	memset(gubFOVDebugInfoInfo, 0, WORLD_MAX);
 #endif
 
 	dirDelta[0]= -WORLD_COLS;