diff --git a/lib/obs-websocket-api.h b/lib/obs-websocket-api.h
index 5607038a..ccaa187f 100644
--- a/lib/obs-websocket-api.h
+++ b/lib/obs-websocket-api.h
@@ -22,6 +22,8 @@ with this program. If not, see <https://www.gnu.org/licenses/>
 
 #include <obs.h>
 
+#define OBS_WEBSOCKET_API_VERSION 1
+
 #ifdef __cplusplus
 extern "C" {
 #endif