diff --git a/src/corelib/io/qlockfile_unix.cpp b/src/corelib/io/qlockfile_unix.cpp
index 815c0f025b..5ff4b1cbe1 100644
--- a/src/corelib/io/qlockfile_unix.cpp
+++ b/src/corelib/io/qlockfile_unix.cpp
@@ -56,7 +56,13 @@
 #   include <cstdio>
 #elif defined(Q_OS_BSD4) && !defined(Q_OS_IOS)
 #   include <sys/user.h>
+# if defined(__GLIBC__) && defined(__FreeBSD_kernel__)
+#   include <sys/cdefs.h>
+#   include <sys/param.h>
+#   include <sys/sysctl.h>
+# else
 #   include <libutil.h>
+# endif
 #endif
 
 QT_BEGIN_NAMESPACE
@@ -234,9 +240,27 @@ QString QLockFilePrivate::processNameByPid(qint64 pid)
     buf[len] = 0;
     return QFileInfo(QFile::decodeName(buf)).fileName();
 #elif defined(Q_OS_BSD4) && !defined(Q_OS_IOS)
+# if defined(__GLIBC__) && defined(__FreeBSD_kernel__)
+    int mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_PID, pid };
+    size_t len = 0;
+    if (sysctl(mib, 4, NULL, &len, NULL, 0) < 0)
+        return QString();
+    kinfo_proc *proc = static_cast<kinfo_proc *>(malloc(len));
+# else
     kinfo_proc *proc = kinfo_getproc(pid);
+# endif
     if (!proc)
         return QString();
+# if defined(__GLIBC__) && defined(__FreeBSD_kernel__)
+    if (sysctl(mib, 4, proc, &len, NULL, 0) < 0) {
+        free(proc);
+        return QString();
+    }
+    if (proc->ki_pid != pid) {
+        free(proc);
+        return QString();
+    }
+# endif
     QString name = QFile::decodeName(proc->ki_comm);
     free(proc);
     return name;