diff --git a/src/BizHawk.Client.EmuHawk/RetroAchievements/RetroAchievements.GameVerification.cs b/src/BizHawk.Client.EmuHawk/RetroAchievements/RetroAchievements.GameVerification.cs
index 7274cb2a40b..feac1a630f6 100644
--- a/src/BizHawk.Client.EmuHawk/RetroAchievements/RetroAchievements.GameVerification.cs
+++ b/src/BizHawk.Client.EmuHawk/RetroAchievements/RetroAchievements.GameVerification.cs
@@ -114,7 +114,7 @@ int GetFileSector(string filename, out int filesize)
 									return sector;
 								}
 
-								filename = filename.Remove(0, slashIndex);
+								filename = filename.Remove(0, slashIndex + 1);
 								numSectors = (filesize + 2047) / 2048;
 							}