diff --git a/code/nel/tools/build_gamedata/d1_client_patch.py b/code/nel/tools/build_gamedata/d1_client_patch.py
index 600347d0b..449d6e0b7 100755
--- a/code/nel/tools/build_gamedata/d1_client_patch.py
+++ b/code/nel/tools/build_gamedata/d1_client_patch.py
@@ -136,7 +136,7 @@ else:
 				needUpdateBnp = needUpdateDirNoSubdirFile(log, sourcePath, targetBnp)
 			if (needUpdateBnp):
 				printLog(log, "BNP " + targetBnp)
-				subprocess.call([ BnpMake, "/p", sourcePath, targetPath ] + package[1])
+				subprocess.call([ BnpMake, "-p", sourcePath, "-o", targetBnp ] + package[1][1:])
 			else:
 				printLog(log, "SKIP " + targetBnp)
 	printLog(log, "")