diff --git a/sys/powerpc/powerpc/intr_machdep.c b/sys/powerpc/powerpc/intr_machdep.c
--- a/sys/powerpc/powerpc/intr_machdep.c
+++ b/sys/powerpc/powerpc/intr_machdep.c
@@ -172,7 +172,7 @@
 
 	powerpc_intrs = mallocarray(num_io_irqs, sizeof(*powerpc_intrs),
 	    M_INTR, M_WAITOK | M_ZERO);
-	nintrcnt = 1 + num_io_irqs * 2 + mp_ncpus * 2;
+	nintrcnt = num_io_irqs * 2 + mp_ncpus * 2;
 #ifdef COUNT_IPIS
 	if (mp_ncpus > 1)
 		nintrcnt += 8 * mp_ncpus;
@@ -183,9 +183,6 @@
 	    M_ZERO);
 	sintrcnt = nintrcnt * sizeof(u_long);
 	sintrnames = nintrcnt * (MAXCOMLEN + 1);
-
-	intrcnt_setname("???", 0);
-	intrcnt_index = 1;
 }
 /*
  * This needs to happen before SI_SUB_CPU
diff --git a/sys/x86/x86/intr_machdep.c b/sys/x86/x86/intr_machdep.c
--- a/sys/x86/x86/intr_machdep.c
+++ b/sys/x86/x86/intr_machdep.c
@@ -176,13 +176,12 @@
 #endif
 
 	/*
-	 * - 1 ??? dummy counter.
 	 * - 2 counters for each I/O interrupt.
 	 * - 1 counter for each CPU for lapic timer.
 	 * - 1 counter for each CPU for the Hyper-V vmbus driver.
 	 * - 8 counters for each CPU for IPI counters for SMP.
 	 */
-	nintrcnt = 1 + num_io_irqs * 2 + mp_ncpus * 2;
+	nintrcnt = num_io_irqs * 2 + mp_ncpus * 2;
 #ifdef COUNT_IPIS
 	if (mp_ncpus > 1)
 		nintrcnt += 8 * mp_ncpus;
@@ -194,9 +193,6 @@
 	sintrcnt = nintrcnt * sizeof(u_long);
 	sintrnames = nintrcnt * (MAXCOMLEN + 1);
 
-	intrcnt_setname("???", 0);
-	intrcnt_index = 1;
-
 	/*
 	 * NB: intrpic_lock is not held here to avoid LORs due to
 	 * malloc() in intr_register_source().  However, we are still