diff --git a/util/nvmutil/nvmutil.c b/util/nvmutil/nvmutil.c
index 517604f1..ad9e24e4 100644
--- a/util/nvmutil/nvmutil.c
+++ b/util/nvmutil/nvmutil.c
@@ -358,7 +358,7 @@ cmd_copy(void)
 			gbe + (part << 12), SIZE_4KB);
 
 		gbeFileModified = 1;
-		nvmPartModified[part] = 1;
+		nvmPartModified[part ^ 1] = 1;
 	}
 }