diff --git a/main.c b/main.c
index 0ce06c3..6eb85a9 100644
--- a/main.c
+++ b/main.c
@@ -18,9 +18,6 @@
     #include <netinet/tcp.h>
     #include <sys/socket.h>
     
-    #ifndef F_TLOCK
-    #define lockf(x, y, z) 0
-    #endif
     #define DAEMON
 #else
     #include <ws2tcpip.h>
@@ -546,7 +543,11 @@ int init_pid_file(const char *fname)
     if (params.pid_fd < 0) {
         return -1;
     }
-    if (lockf(params.pid_fd, F_TLOCK, 0) < 0) {
+    struct flock fl = { 
+        .l_whence = SEEK_CUR,
+        .l_type = F_WRLCK
+    };
+    if (fcntl(params.pid_fd, F_SETLK, &fl) < 0) {
         return -1;
     }
     params.pid_file = fname;
@@ -566,7 +567,6 @@ void clear_params(void)
     #endif
     #ifdef DAEMON
     if (params.pid_fd > 0) {
-        lockf(params.pid_fd, F_ULOCK, 0);
         close(params.pid_fd);
     }
     if (params.pid_file) {