diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index ee34673b..053ca1d9 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -150,6 +150,8 @@ endif (HAVE_GETADDRINFO_A AND WITH_ADNS)
 if (UNIX)
 	if (APPLE)
 		set (MOSQ_LIBS ${MOSQ_LIBS} dl m)
+    elseif (${CMAKE_SYSTEM_NAME} MATCHES "OpenBSD")
+	    set (MOSQ_LIBS ${MOSQ_LIBS} m)
     elseif(QNX)
         set(MOSQ_LIBS ${MOSQ_LIBS} m socket)
     else(APPLE)