diff --git a/model/sync-app-socket-c.h b/model/sync-app-socket-c.h
index 12e74b2..77afc79 100644
--- a/model/sync-app-socket-c.h
+++ b/model/sync-app-socket-c.h
@@ -26,12 +26,12 @@
 #include "sync-app-socket.h"
 
 extern "C" {
-	typedef struct SyncAppSocketStruct;
+  typedef struct SyncAppSocketStruct;
 
-	SyncAppSocketStruct *create_sync_app_socket(const char *prefix, void (*callback)(const char *, const char *));
-	void delete_sync_app_socket(SyncAppSocketStruct **sock);
-	bool sync_app_socket_publish(SyncAppSocketStruct *sock, const char *prefix, uint32_t session, const char *buf, int freshness);
-	void sync_app_socket_remove(SyncAppSocketStruct *sock, const char *prefix);
+  SyncAppSocketStruct *create_sync_app_socket(const char *prefix, void (*callback)(const char *, const char *));
+  void delete_sync_app_socket(SyncAppSocketStruct **sock);
+  bool sync_app_socket_publish(SyncAppSocketStruct *sock, const char *prefix, uint32_t session, const char *buf, int freshness);
+  void sync_app_socket_remove(SyncAppSocketStruct *sock, const char *prefix);
 }
 
 #endif // SYNC_APP_SOCKET_C_H