diff --git a/src/files.cpp b/src/files.cpp
index 0b7203236..93a8c9729 100644
--- a/src/files.cpp
+++ b/src/files.cpp
@@ -527,7 +527,7 @@ long MemoryReader::Seek (long offset, int origin)
 		break;
 
 	}
-	FilePos=clamp<long>(offset,0,Length-1);
+	FilePos=clamp<long>(offset,0,Length);
 	return 0;
 }
 
@@ -583,7 +583,7 @@ long MemoryArrayReader::Seek (long offset, int origin)
         break;
 
     }
-    FilePos=clamp<long>(offset,0,Length-1);
+    FilePos=clamp<long>(offset,0,Length);
     return 0;
 }