diff --git a/gnu/usr.bin/gdb/kgdb/kthr.c b/gnu/usr.bin/gdb/kgdb/kthr.c
index 461f408a73d9..7b39929fa55a 100644
--- a/gnu/usr.bin/gdb/kgdb/kthr.c
+++ b/gnu/usr.bin/gdb/kgdb/kthr.c
@@ -107,7 +107,7 @@ kgdb_thr_init(void)
 	addr = kgdb_lookup("stopped_cpus");
 	CPU_ZERO(&stopped_cpus);
 	cpusetsize = sysconf(_SC_CPUSET_SIZE);
-	if (cpusetsize != -1 && (u_long)cpusetsize <= sizeof(cpuset_t) &&
+	if (cpusetsize != -1 && (size_t)cpusetsize <= sizeof(cpuset_t) &&
 	    addr != 0)
 		kvm_read(kvm, addr, &stopped_cpus, cpusetsize);
 
diff --git a/lib/libkvm/kvm_pcpu.c b/lib/libkvm/kvm_pcpu.c
index bc73baff19cc..7e421aeb893c 100644
--- a/lib/libkvm/kvm_pcpu.c
+++ b/lib/libkvm/kvm_pcpu.c
@@ -131,7 +131,7 @@ kvm_getpcpu(kvm_t *kd, int cpu)
 	}
 
 	kcpusetsize = sysconf(_SC_CPUSET_SIZE);
-	if (kcpusetsize == -1 || (u_long)kcpusetsize > sizeof(cpuset_t))
+	if (kcpusetsize == -1 || (size_t)kcpusetsize > sizeof(cpuset_t))
 		return ((void *)-1);
 
 	if (maxcpu == 0)
diff --git a/lib/libmemstat/memstat_uma.c b/lib/libmemstat/memstat_uma.c
index 485a4f279906..b9bde7d4179c 100644
--- a/lib/libmemstat/memstat_uma.c
+++ b/lib/libmemstat/memstat_uma.c
@@ -341,7 +341,7 @@ memstat_kvm_uma(struct memory_type_list *list, void *kvm_handle)
 		return (-1);
 	}
 	cpusetsize = sysconf(_SC_CPUSET_SIZE);
-	if (cpusetsize == -1 || (u_long)cpusetsize > sizeof(cpuset_t)) {
+	if (cpusetsize == -1 || (size_t)cpusetsize > sizeof(cpuset_t)) {
 		list->mtl_error = MEMSTAT_ERROR_KVM_NOSYMBOL;
 		return (-1);
 	}
diff --git a/usr.sbin/pmccontrol/pmccontrol.c b/usr.sbin/pmccontrol/pmccontrol.c
index 80d4bd7c3dde..28f7ab493363 100644
--- a/usr.sbin/pmccontrol/pmccontrol.c
+++ b/usr.sbin/pmccontrol/pmccontrol.c
@@ -148,7 +148,7 @@ pmcc_do_enable_disable(struct pmcc_op_list *op_list)
 
 	/* Determine the set of active CPUs. */
 	cpusetsize = sysconf(_SC_CPUSET_SIZE);
-	if (cpusetsize == -1 || (u_long)cpusetsize > sizeof(cpuset_t)) {
+	if (cpusetsize == -1 || (size_t)cpusetsize > sizeof(cpuset_t)) {
 		err(EX_OSERR, "ERROR: Cannot determine which CPUs are "
 		    "halted");
 	}