diff --git a/fwinebox.py b/fwinebox.py
index 45f90cf..8d70f3a 100755
--- a/fwinebox.py
+++ b/fwinebox.py
@@ -122,7 +122,7 @@ def main():
 					os.makedirs(prefixFolder)
 					if (syswow == False): os.environ["WINEARCH"] = "win32"
 					launchPrefix(prefix,["wine","winecfg"])
-					del os.environ["WINEARCH"]
+					if "WINEARCH" in os.environ: del os.environ["WINEARCH"]
 					break
 				
 				break