diff --git a/event-config.h.cmake b/event-config.h.cmake
index 7cf2493f..76e0d1f9 100644
--- a/event-config.h.cmake
+++ b/event-config.h.cmake
@@ -526,7 +526,7 @@
 /* Define to `int' if <sys/types.h> does not define. */
 #define EVENT__ssize_t @EVENT__ssize_t@
 
-#define EVENT__NEED_DLLIMPORT @EVENT__NEED_DLLIMPORT@
+#cmakedefine EVENT__NEED_DLLIMPORT
 
 /* Define to 1 if you have ERR_remove_thread_stat(). */
 #cmakedefine EVENT__HAVE_ERR_REMOVE_THREAD_STATE