diff --git a/config/config.go b/config/config.go
index 9cd3cce..a2dd6b6 100644
--- a/config/config.go
+++ b/config/config.go
@@ -68,6 +68,14 @@ type NodeConfig struct {
 
 	FeeParams []*FeeParamsSettings `json:"feeParams"`
 
+	// When a htlc comes in where a channel open is needed, and that payment
+	// was registered with a promise, but the promise has expired, lspd may
+	// open the channel anyway if the fee is low enough right now (the promise
+	// fee was higher than the current fee). ExpiredPromiseMultiplicationFactor
+	// is the multiplication factor to use on the mempool fee rate to check
+	// whether the min fee of the promise is lower than the current min fee.
+	ExpiredPromiseMultiplicationFactor uint64
+
 	// Set this field to connect to an LND node.
 	Lnd *LndConfig `json:"lnd,omitempty"`
 
diff --git a/interceptor/intercept.go b/interceptor/intercept.go
index c0a299e..d2fa842 100644
--- a/interceptor/intercept.go
+++ b/interceptor/intercept.go
@@ -123,11 +123,25 @@ func (i *Interceptor) Intercept(nextHop string, reqPaymentHash []byte, reqOutgoi
 				}
 
 				if time.Now().UTC().After(validUntil) {
-					log.Printf("Intercepted expired payment registration. Failing payment. payment hash: %x, valid until: %s", paymentHash, params.ValidUntil)
-					return InterceptResult{
-						Action:      INTERCEPT_FAIL_HTLC_WITH_CODE,
-						FailureCode: FAILURE_TEMPORARY_CHANNEL_FAILURE,
-					}, nil
+					feeEstimate, err := i.feeEstimator.EstimateFeeRate(context.Background(), i.feeStrategy)
+					if err != nil {
+						log.Printf("Intercepted expired payment registration. Failing payment. payment hash: %x, valid until: %s", paymentHash, params.ValidUntil)
+						return InterceptResult{
+							Action:      INTERCEPT_FAIL_HTLC_WITH_CODE,
+							FailureCode: FAILURE_TEMPORARY_CHANNEL_FAILURE,
+						}, nil
+					}
+
+					minMsat := uint64(feeEstimate.SatPerVByte * float64(i.config.ExpiredPromiseMultiplicationFactor))
+					if minMsat >= params.MinMsat {
+						log.Printf("Intercepted expired payment registration. Failing payment. payment hash: %x, valid until: %s", paymentHash, params.ValidUntil)
+						return InterceptResult{
+							Action:      INTERCEPT_FAIL_HTLC_WITH_CODE,
+							FailureCode: FAILURE_TEMPORARY_CHANNEL_FAILURE,
+						}, nil
+					}
+
+					log.Printf("Intercepted expired payment registration. Opening channel anyway, because it's cheaper at the current rate. feeEstimate: %v minMsat: %v, params: %+v", feeEstimate.SatPerVByte, minMsat, params)
 				}
 
 				channelPoint, err = i.openChannel(reqPaymentHash, destination, incomingAmountMsat)