diff --git a/configure b/configure
index 0a503fa..2d13e8b 100755
--- a/configure
+++ b/configure
@@ -7097,6 +7097,9 @@ case $target in
 		;;
 	*-*-netbsd*)
 		;;
+	*-*-libertybsd*)
+		CXXFLAGS="${CXXFLAGS} -DTW_LibertyBSD"
+		;;
 	i[0-9]86-pc-linux*)
 		;;
 	sparc-*-linux*)
diff --git a/configure.ac b/configure.ac
index 2efec78..ca3439d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -338,6 +338,9 @@ case $target in
 		;;
 	*-*-netbsd*)
 		;;
+	*-*-libertybsd*)
+		CXXFLAGS="${CXXFLAGS} -DTW_LibertyBSD"
+		;;
 	i[[0-9]]86-pc-linux*)
 		;;
 	sparc-*-linux*)
diff --git a/src/core/platform.h b/src/core/platform.h
index 7faeb7e..ba40bcc 100644
--- a/src/core/platform.h
+++ b/src/core/platform.h
@@ -66,6 +66,7 @@
 #define OS_MIDNIGHTBSD  0x0306
 #define OS_MIRBSD       0x0307
 #define OS_BITRIG       0x0308
+#define OS_LIBERTYBSD   0x0309
 
 #define OS_SOLARIS      0x0400
 #define OS_AIX          0x0401
@@ -162,6 +163,10 @@
     #define OS                  OS_BITRIG
     #define IS_BITRIG           1
 
+#elif defined(TW_LibertyBSD)
+    #define OS                  OS_LIBERTYBSD
+    #define IS_LIBERTYBSD       1
+
 #elif defined(__OpenBSD__)
     #define OS                  OS_OPENBSD
     #define IS_OPENBSD          1
diff --git a/src/twtest/platform_t.cpp b/src/twtest/platform_t.cpp
index 7e937bf..fffdf4d 100644
--- a/src/twtest/platform_t.cpp
+++ b/src/twtest/platform_t.cpp
@@ -261,6 +261,8 @@ const TSTRING expected_os("NetBSD");
 const TSTRING expected_os("MirBSD");
 #elif IS_BITRIG
 const TSTRING expected_os("Bitrig");
+#elif IS_LIBERTYBSD
+const TSTRING expected_os("LibertyBSD");
 #elif IS_OPENBSD
 const TSTRING expected_os("OpenBSD");
 #elif IS_SOLARIS