diff --git a/reactos/include/reactos/arc/setupblk.h b/reactos/include/reactos/arc/setupblk.h
index 4ee17414787..618a1daee24 100644
--- a/reactos/include/reactos/arc/setupblk.h
+++ b/reactos/include/reactos/arc/setupblk.h
@@ -149,7 +149,7 @@ typedef struct _SETUP_LOADER_BLOCK
     PCHAR MachineDirectoryPath;
     PCHAR NetBootSifPath;
     PVOID NetBootSecret;
-    CHAR NetBootIMirrorFilePath[26];
+    CHAR NetBootIMirrorFilePath[260];
     PCHAR ASRPnPSifFile;
     ULONG ASRPnPSifFileLength;
     CHAR NetBootAdministratorPassword[64];