diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 07d64ab..015fd48 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -125,7 +125,7 @@ if(UNIX)
 target_link_libraries(rtl_fm m)
 target_link_libraries(rtl_adsb m)
 target_link_libraries(rtl_power m)
-if(APPLE)
+if(APPLE OR CMAKE_SYSTEM MATCHES "OpenBSD")
     target_link_libraries(rtl_test m)
 else()
     target_link_libraries(rtl_test m rt)