diff --git a/configure.ac b/configure.ac
index a1d054d4..14653c33 100644
--- a/configure.ac
+++ b/configure.ac
@@ -68,6 +68,19 @@ AC_MSG_RESULT([$os_windows])
 
 AM_CONDITIONAL([OS_WINDOWS], [test "x$os_windows" = "xyes"])
 
+# ==================== DETECT FREEBSD ====================
+AC_MSG_CHECKING([for FreeBSD])
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+#ifndef __FreeBSD__
+#error "Not FreeBSD"
+#endif
+]], [[ return 0; ]])],
+    [os_freebsd=yes],
+    [os_freebsd=no])
+AC_MSG_RESULT([$os_freebsd])
+
+AM_CONDITIONAL([OS_FREEBSD], [test "x$os_freebsd" = "xyes"])
+
 # Checks for header files, typedefs, functions...
 AC_CHECK_HEADERS([arpa/inet.h fcntl.h limits.h netinet/in.h stdlib.h string.h sys/ioctl.h sys/socket.h unistd.h])
 AC_TYPE_SIZE_T
diff --git a/src/Makefile.am b/src/Makefile.am
index 4c4db743..4a289e94 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -27,9 +27,14 @@ if OS_WINDOWS
 utun_TUN_SOURCES = tun_windows.c
 utun_TUN_LIBS = -liphlpapi -lws2_32 -ladvapi32 -lbcrypt -ldbghelp
 else
+if OS_FREEBSD
+utun_TUN_SOURCES = tun_freebsd.c
+utun_TUN_LIBS =
+else
 utun_TUN_SOURCES = tun_linux.c
 utun_TUN_LIBS =
 endif
+endif
 
 # TinyCrypt sources (only used without OpenSSL)
 utun_TINYCRYPT_SOURCES = \