diff --git a/contrib/c-ares-cmake/CMakeLists.txt b/contrib/c-ares-cmake/CMakeLists.txt
index 63e145bec18..86ab6f90260 100644
--- a/contrib/c-ares-cmake/CMakeLists.txt
+++ b/contrib/c-ares-cmake/CMakeLists.txt
@@ -48,6 +48,7 @@ SET(SRCS
     "${LIBRARY_DIR}/src/lib/ares_platform.c"
     "${LIBRARY_DIR}/src/lib/ares_process.c"
     "${LIBRARY_DIR}/src/lib/ares_query.c"
+    "${LIBRARY_DIR}/src/lib/ares_rand.c"
     "${LIBRARY_DIR}/src/lib/ares_search.c"
     "${LIBRARY_DIR}/src/lib/ares_send.c"
     "${LIBRARY_DIR}/src/lib/ares_strcasecmp.c"