diff --git a/DATabase/DATabase.cs b/DATabase/DATabase.cs
index 4f75c766..3da53bd1 100644
--- a/DATabase/DATabase.cs
+++ b/DATabase/DATabase.cs
@@ -593,7 +593,7 @@ namespace SabreTools
 				{
 					InitUpdate(input, filename, name, description, category, version, date, author, email, homepage, url, comment, header,
 						superdat, forcemerge, forcend, forcepack, outputCMP, outputMiss, outputRC, outputSD, outputXML, usegame, prefix,
-						postfix, quotes, repext, addext, datprefix, romba, tsv, outdir, clean);
+						postfix, quotes, repext, addext, datprefix, romba, tsv, outdir, clean, dedup);
 				}
 			}
 
diff --git a/DATabase/Partials/DATabase_Inits.cs b/DATabase/Partials/DATabase_Inits.cs
index 4df01e41..fbf74631 100644
--- a/DATabase/Partials/DATabase_Inits.cs
+++ b/DATabase/Partials/DATabase_Inits.cs
@@ -108,6 +108,7 @@ namespace SabreTools
 		/// <param name="tsv">Output files in TSV format</param>
 		/// <param name="outdir">Optional param for output directory</param>
 		/// <param name="clean">True to clean the game names to WoD standard, false otherwise (default)</param>
+		/// <param name="dedup">True to dedupe the roms in the DAT, false otherwise (default)</param>
 		private static void InitUpdate(string input,
 			string filename,
 			string name,
@@ -140,7 +141,8 @@ namespace SabreTools
 			bool romba,
 			bool tsv,
 			string outdir,
-			bool clean)
+			bool clean,
+			bool dedup)
 		{
 			// Set the special flags
 			ForceMerging fm = ForceMerging.None;
@@ -214,7 +216,7 @@ namespace SabreTools
 				ForceMerging = fm,
 				ForceNodump = fn,
 				ForcePacking = fp,
-				MergeRoms = false,
+				MergeRoms = dedup,
 
 				UseGame = usegame,
 				Prefix = prefix,
diff --git a/SabreHelper/Data/Build.cs b/SabreHelper/Data/Build.cs
index 940f094a..076108f0 100644
--- a/SabreHelper/Data/Build.cs
+++ b/SabreHelper/Data/Build.cs
@@ -174,6 +174,7 @@ Options:
 		Supported values are:
 			None, Zip, Unzip
 	-clean			Clean game names according to WoD standards
+	-dd, --dedup		Enable deduping in the created DAT
 	-out=			Output directory
 
 Filenames and directories can't start with a reserved string