diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4acb99612f..708f8a1bfa 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -889,6 +889,12 @@ if (NOT EVENT__DISABLE_SAMPLES)
 
         add_dependencies(${SAMPLE} event_extra)
     endforeach()
+
+    if (WIN32)
+        target_sources(dns-example PUBLIC
+                       WIN32-Code/getopt.c
+                       WIN32-Code/getopt_long.c)
+    endif()
 endif()
 
 if (NOT EVENT__DISABLE_BENCHMARK)