diff --git a/app/action.c b/app/action.c
index 78c31d5..9e45aac 100644
--- a/app/action.c
+++ b/app/action.c
@@ -14,6 +14,7 @@
  *     limitations under the License.
  */
 
+#include <assert.h>
 #include <string.h>
 
 #include "app/action.h"