diff --git a/UGO.py b/UGO.py
index 6e916d2..cd7fe9f 100644
--- a/UGO.py
+++ b/UGO.py
@@ -175,7 +175,7 @@ class UGO:
 						
 						if name+".tmb" in names:
 							j = 2
-							while "%s_%i.tmb" % (name, j) not in names:
+							while "%s_%i.tmb" % (name, j) in names:
 								j += 1
 							name = "%s_%i" % (name, j)
 						
@@ -189,7 +189,7 @@ class UGO:
 						
 						if name+".ntft" in names:
 							j = 2
-							while "%s_%i.ntft" % (name, j) not in names:
+							while "%s_%i.ntft" % (name, j) in names:
 								j += 1
 							name = "%s_%i" % (name, j)
 						
@@ -551,7 +551,7 @@ class UGO:
 if __name__ == "__main__":
 	print "              ==      UGO.py      =="
 	print "             ==      by pbsds      =="
-	print "              ==       v0.92      =="
+	print "              ==       v0.93      =="
 	print
 	
 	if len(sys.argv) < 2:
@@ -622,4 +622,4 @@ if __name__ == "__main__":
 		
 		print "Writing UGO..."
 		ugo.WriteFile(output)
-		print "Done"
\ No newline at end of file
+		print "Done"