diff --git a/.travis.yml b/.travis.yml
index 41d0e4e..59fa62d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,6 +3,7 @@ language: c
 os:
   - linux
   - osx
+  - freebsd
 env:
   global:
     - CTEST_OUTPUT_ON_FAILURE=ON
@@ -20,6 +21,7 @@ addons:
       - yasm
 before_install:
   - if [ $TRAVIS_OS_NAME == osx ]; then brew install yasm; fi
+  - if [ $TRAVIS_OS_NAME == freebsd ]; then sudo pkg install -y yasm; fi
 
 before_script:
   - cmake . -DSUBHOOK_FORCE_32BIT=`([ $ARCH = x86 ] && echo 'ON') || echo 'OFF'`
diff --git a/subhook.h b/subhook.h
index f2fbc8b..d2f6814 100644
--- a/subhook.h
+++ b/subhook.h
@@ -41,11 +41,8 @@
 
 #if defined _WIN32 || defined __CYGWIN__
   #define SUBHOOK_WINDOWS
-#elif defined __linux__
-  #define SUBHOOK_LINUX
-  #define SUBHOOK_UNIX
-#elif defined __APPLE__
-  #define SUBHOOK_MACOS
+#elif defined __linux__ || defined __APPLE__ \
+   || defined __FreeBSD__ || defined __OpenBSD__ || defined __NetBSD__
   #define SUBHOOK_UNIX
 #else
   #error Unsupported operating system