diff --git a/bmc.c b/bmc.c
index 462a90d..4b435b2 100644
--- a/bmc.c
+++ b/bmc.c
@@ -120,7 +120,8 @@ int dscmp(struct dataset *a, struct dataset *b)
 	return diff < 0 ? A_BETTER : B_BETTER;
 }
 
-enum port_state bmc_state_decision(struct clock *c, struct port *r)
+enum port_state bmc_state_decision(struct clock *c, struct port *r,
+				   int (*compare)(struct dataset *a, struct dataset *b))
 {
 	struct dataset *clock_ds, *clock_best, *port_best;
 	enum port_state ps;
@@ -134,14 +135,14 @@ enum port_state bmc_state_decision(struct clock *c, struct port *r)
 		return ps;
 
 	if (clock_class(c) <= 127) {
-		if (dscmp(clock_ds, port_best) > 0) {
+		if (compare(clock_ds, port_best) > 0) {
 			return PS_GRAND_MASTER; /*M1*/
 		} else {
 			return PS_PASSIVE; /*P1*/
 		}
 	}
 
-	if (dscmp(clock_ds, clock_best) > 0) {
+	if (compare(clock_ds, clock_best) > 0) {
 		return PS_GRAND_MASTER; /*M2*/
 	}
 
@@ -149,7 +150,7 @@ enum port_state bmc_state_decision(struct clock *c, struct port *r)
 		return PS_SLAVE; /*S1*/
 	}
 
-	if (dscmp(clock_best, port_best) == A_BETTER_TOPO) {
+	if (compare(clock_best, port_best) == A_BETTER_TOPO) {
 		return PS_PASSIVE; /*P2*/
 	} else {
 		return PS_MASTER; /*M3*/
diff --git a/bmc.h b/bmc.h
index 81b3ee6..23e7686 100644
--- a/bmc.h
+++ b/bmc.h
@@ -28,12 +28,14 @@
  * BMC state decision algorithm.
  * @param c  The local clock.
  * @param r  The port in question.
+ * @param compare  The data set comparison algorithm.
  * @return   A @ref port_state value as the recommended state.
  */
-enum port_state bmc_state_decision(struct clock *c, struct port *r);
+enum port_state bmc_state_decision(struct clock *c, struct port *r,
+				   int (*comapre)(struct dataset *a, struct dataset *b));
 
 /**
- * Compare two data sets.
+ * Compare two data sets using the algorithm defined in IEEE 1588.
  * @param a A dataset to compare.
  * @param b A dataset to compare.
  * @return An integer less than, equal to, or greater than zero
diff --git a/clock.c b/clock.c
index 9f0d3be..bc67fb4 100644
--- a/clock.c
+++ b/clock.c
@@ -1723,7 +1723,7 @@ static void handle_state_decision_event(struct clock *c)
 	LIST_FOREACH(piter, &c->ports, list) {
 		enum port_state ps;
 		enum fsm_event event;
-		ps = bmc_state_decision(c, piter);
+		ps = bmc_state_decision(c, piter, c->dscmp);
 		switch (ps) {
 		case PS_LISTENING:
 			event = EV_NONE;