diff --git a/src/Client/World/MapMgr.cpp b/src/Client/World/MapMgr.cpp
index f487998..30dfc6b 100644
--- a/src/Client/World/MapMgr.cpp
+++ b/src/Client/World/MapMgr.cpp
@@ -123,7 +123,7 @@ float MapMgr::GetZ(float x, float y)
     MapTile *tile = _tiles->GetTile(xg,yg);
     if(tile)
     {
-#ifndef _DEBUG
+#ifdef _DEBUG
         tile->DebugDumpToFile();
         logdebug("DEBUG: tile dumped");
 #endif
diff --git a/src/shared/MapTile.cpp b/src/shared/MapTile.cpp
index f6fcb4c..238d69b 100644
--- a/src/shared/MapTile.cpp
+++ b/src/shared/MapTile.cpp
@@ -93,7 +93,7 @@ float MapTile::GetZ(float x, float y)
 
     return real_z;
 }
-#ifndef _DEBUG
+#ifdef _DEBUG
 void MapTile::DebugDumpToFile(void)
 {
     const char *f = "0123456789abcdefghijklmnopqrstuvwxyz";
diff --git a/src/shared/MapTile.h b/src/shared/MapTile.h
index fe45100..051cda9 100644
--- a/src/shared/MapTile.h
+++ b/src/shared/MapTile.h
@@ -31,7 +31,7 @@ public:
     void ImportFromADT(ADTFile*);
     float GetZ(float,float);
 
-#ifndef _DEBUG
+#ifdef _DEBUG
     void DebugDumpToFile(void);
 #endif