diff --git a/src/util/virstoragefile.c b/src/util/virstoragefile.c
index 7a4f9a0b39..8568ebb1e7 100644
--- a/src/util/virstoragefile.c
+++ b/src/util/virstoragefile.c
@@ -161,7 +161,7 @@ qedGetBackingStore(char **, int *, const char *, size_t);
 #define QCOWX_HDR_BACKING_FILE_SIZE (QCOWX_HDR_BACKING_FILE_OFFSET+8)
 #define QCOWX_HDR_IMAGE_SIZE (QCOWX_HDR_BACKING_FILE_SIZE+4+4)
 
-#define QCOW1_HDR_CRYPT (QCOWX_HDR_IMAGE_SIZE+8+1+1)
+#define QCOW1_HDR_CRYPT (QCOWX_HDR_IMAGE_SIZE+8+1+1+2)
 #define QCOW2_HDR_CRYPT (QCOWX_HDR_IMAGE_SIZE+8)
 
 #define QCOW1_HDR_TOTAL_SIZE (QCOW1_HDR_CRYPT+4+8)