diff --git a/src/Common/Apidrvr.h b/src/Common/Apidrvr.h
index f14319ed..76aafc20 100644
--- a/src/Common/Apidrvr.h
+++ b/src/Common/Apidrvr.h
@@ -120,6 +120,7 @@ typedef struct
 	unsigned __int64 diskLength[26];
 	int ea[26];
 	int volumeType[26];	/* Volume type (e.g. PROP_VOL_TYPE_OUTER, PROP_VOL_TYPE_OUTER_VOL_WRITE_PREVENTED, etc.) */
+	BOOL truecryptMode[26];
 } MOUNT_LIST_STRUCT;
 
 typedef struct
diff --git a/src/Driver/Ntdriver.c b/src/Driver/Ntdriver.c
index 5ed407dd..7535ed21 100644
--- a/src/Driver/Ntdriver.c
+++ b/src/Driver/Ntdriver.c
@@ -1146,6 +1146,7 @@ NTSTATUS ProcessMainDeviceControlIrp (PDEVICE_OBJECT DeviceObject, PEXTENSION Ex
 						list->volumeType[ListExtension->nDosDriveNo] = PROP_VOL_TYPE_OUTER;	// Normal/outer volume (hidden volume protected)
 					else
 						list->volumeType[ListExtension->nDosDriveNo] = PROP_VOL_TYPE_NORMAL;	// Normal volume
+					list->truecryptMode[ListExtension->nDosDriveNo] = ListExtension->cryptoInfo->bTrueCryptMode;
 				}
 			}