diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3127611..f8b37a9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -136,6 +136,8 @@
     set(TARGET_FREEBSD YES)
     set(ENABLE_DCO YES)
     link_libraries(-lnv)
+elseif (${CMAKE_SYSTEM_NAME} STREQUAL "OpenBSD")
+    set(TARGET_OPENBSD YES)
 elseif (${CMAKE_SYSTEM_NAME} STREQUAL "SunOS")
     set(TARGET_SOLARIS YES)
     set(HAVE_SYS_SOCKIO_H 1)
@@ -169,7 +171,7 @@
 check_symbol_exists(setgid unistd.h HAVE_SETGID)
 check_symbol_exists(setuid unistd.h HAVE_SETUID)
 check_symbol_exists(setsid unistd.h HAVE_SETSID)
-check_symbol_exists(getpeereid unistd.h HAVE_GETPEEREID)
+check_symbol_exists(getpeereid "unistd.h;sys/socket.h" HAVE_GETPEEREID)
 
 check_symbol_exists(epoll_create sys/epoll.h HAVE_EPOLL_CREATE)