diff --git a/MergeDAT/MergeDAT.cs b/MergeDAT/MergeDAT.cs
index 00bd3283..8bfb058d 100644
--- a/MergeDAT/MergeDAT.cs
+++ b/MergeDAT/MergeDAT.cs
@@ -54,12 +54,12 @@ namespace SabreTools
 					case "--log":
 						tofile = true;
 						break;
-					case "-d":
+					case "-di":
 					case "--diff":
 						diff = true;
 						break;
-					case "-m":
-					case "--merge":
+					case "-dd":
+					case "--dedup":
 						merge = true;
 						break;
 					default:
diff --git a/SabreHelper/Build.cs b/SabreHelper/Build.cs
index 69a57fd2..c6caabef 100644
--- a/SabreHelper/Build.cs
+++ b/SabreHelper/Build.cs
@@ -156,8 +156,8 @@ Usage: MergeDAT [options] [filename] ...
 Options:
   -h, -?, --help	Show this help dialog
   -l, --log		Enable log to file
-  -d, --diff		Switch to diffdat mode
-  -m, --merge	Enable deduping in the created DAT");
+  -di, --diff		Switch to diffdat mode
+  -dd, --dedup	Enable deduping in the created DAT");
 					break;
 				case "DatToMiss":
 					Console.WriteLine(@"DatToMiss - Generate a miss file from a DAT