diff --git a/CHANGES b/CHANGES
index 5a607d669..443544da2 100644
--- a/CHANGES
+++ b/CHANGES
@@ -5,6 +5,7 @@ Other fixes:
  - Core: Fix memory leak in opening games from the library
  - Qt: Fix infrequent deadlock when using sync to video
  - Qt: Fix applying savetype-only overrides
+ - Util: Fix loading UPS patches that affect the last byte of the file
 
 0.9.1: (2021-04-18)
 Emulation fixes:
diff --git a/src/util/patch-ups.c b/src/util/patch-ups.c
index ea1d531eb..6c0334feb 100644
--- a/src/util/patch-ups.c
+++ b/src/util/patch-ups.c
@@ -87,15 +87,16 @@ bool _UPSApplyPatch(struct Patch* patch, const void* in, size_t inSize, void* ou
 			if (patch->vf->read(patch->vf, &byte, 1) != 1) {
 				return false;
 			}
+			if (!byte) {
+				break;
+			}
 			if (offset >= outSize) {
 				return false;
 			}
 			buf[offset] ^= byte;
 			++offset;
-			if (!byte) {
-				break;
-			}
 		}
+		++offset;
 		alreadyRead = patch->vf->seek(patch->vf, 0, SEEK_CUR);
 	}