diff --git a/src/sys/volume.c b/src/sys/volume.c
index 0e94d897..40fbf9f0 100644
--- a/src/sys/volume.c
+++ b/src/sys/volume.c
@@ -161,6 +161,10 @@ NTSTATUS FspVolumeGetName(
 {
     PAGED_CODE();
 
+    ASSERT(IRP_MJ_FILE_SYSTEM_CONTROL == IrpSp->MajorFunction);
+    ASSERT(IRP_MN_USER_FS_REQUEST == IrpSp->MinorFunction);
+    ASSERT(FSP_FSCTL_VOLUME_NAME == IrpSp->Parameters.FileSystemControl.FsControlCode);
+
     /* check parameters */
     ULONG OutputBufferLength = IrpSp->Parameters.FileSystemControl.OutputBufferLength;
     PVOID SystemBuffer = Irp->AssociatedIrp.SystemBuffer;