Index: src/lib/fcitx-utils/misc.cpp
--- src/lib/fcitx-utils/misc.cpp.orig
+++ src/lib/fcitx-utils/misc.cpp
@@ -87,7 +87,7 @@ std::string getProcessName(pid_t pid) {
         struct kinfo_proc2 *kp = kvm_getproc2(vm, KERN_PROC_PID, pid,
                                               sizeof(struct kinfo_proc2), &cnt);
 #else
-        struct kinfo_proc *kp = kvm_getprocs(vm, KERN_PROC_PID, pid, &cnt);
+        struct kinfo_proc *kp = kvm_getprocs(vm, KERN_PROC_PID, pid, sizeof(struct kinfo_proc), &cnt);
 #endif
         if ((cnt != 1) || (kp == 0)) {
             break;
