diff --git a/src/dsp/base.c b/src/dsp/base.c
index 1b16381..c3a5ed9 100644
--- a/src/dsp/base.c
+++ b/src/dsp/base.c
@@ -552,7 +552,7 @@
 
 	// Any enum value above PLDM_XFER_CURRENT_PART is invalid.
 	if (request->transfer_opflag > PLDM_XFER_CURRENT_PART) {
-		return PLDM_INVALID_TRANSFER_OPERATION_FLAG;
+		return PLDM_ERROR_UNEXPECTED_TRANSFER_FLAG_OPERATION;
 	}
 
 	// A section offset of 0 is only valid on FIRST_PART or COMPLETE Xfers.