diff --git a/SabreHelper/RomManipulation.cs b/SabreHelper/RomManipulation.cs
index d095035c..3eb9dc73 100644
--- a/SabreHelper/RomManipulation.cs
+++ b/SabreHelper/RomManipulation.cs
@@ -272,7 +272,7 @@ namespace SabreTools.Helper
 					}
 
 					// Now add the rom to the dictionary
-					string key = rom.CRC + "-" + rom.Size;
+					string key = rom.Size + "-" + rom.CRC;
 					if (datdata.Roms.ContainsKey(key))
 					{
 						datdata.Roms[key].Add(rom);
@@ -502,7 +502,7 @@ namespace SabreTools.Helper
 						};
 
 						// Add the new rom
-						string key = rom.CRC + "-" + rom.Size;
+						string key = rom.Size + "-" + rom.CRC;
 						if (datdata.Roms.ContainsKey(key))
 						{
 							datdata.Roms[key].Add(rom);