diff --git a/scst/include/scst_const.h b/scst/include/scst_const.h
index 06bf7e923..036078e41 100644
--- a/scst/include/scst_const.h
+++ b/scst/include/scst_const.h
@@ -413,6 +413,10 @@ static inline int scst_sense_response_code(const uint8_t *sense)
 #define WRITE_SAME_16	      0x93
 #endif
 
+#ifndef SYNCHRONIZE_CACHE_16
+#define SYNCHRONIZE_CACHE_16  0x91
+#endif
+
 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 33)
 /*
  * From <scsi/scsi.h>. See also commit
diff --git a/scst/src/dev_handlers/scst_vdisk.c b/scst/src/dev_handlers/scst_vdisk.c
index 2ef06e5ff..a7fb1b298 100644
--- a/scst/src/dev_handlers/scst_vdisk.c
+++ b/scst/src/dev_handlers/scst_vdisk.c
@@ -1399,6 +1399,7 @@ static enum compl_status_e vdisk_invalid_opcode(struct vdisk_cmd_params *p)
 
 #define SHARED_OPS							\
 	[SYNCHRONIZE_CACHE] = vdisk_synchronize_cache,			\
+	[SYNCHRONIZE_CACHE_16] = vdisk_synchronize_cache,		\
 	[MODE_SENSE] = vdisk_exec_mode_sense,				\
 	[MODE_SENSE_10] = vdisk_exec_mode_sense,			\
 	[MODE_SELECT] = vdisk_exec_mode_select,				\
diff --git a/usr/fileio/common.c b/usr/fileio/common.c
index 96a674144..c756e7736 100644
--- a/usr/fileio/common.c
+++ b/usr/fileio/common.c
@@ -335,6 +335,7 @@ static int do_exec(struct vdisk_cmd *vcmd)
 		}
 		break;
 	case SYNCHRONIZE_CACHE:
+	case SYNCHRONIZE_CACHE_16:
 	{
 		int immed = cdb[1] & 0x2;
 		if (data_len == 0)