diff --git a/src/output/amgc_output_typedef.c b/src/output/amgc_output_typedef.c
index 2400916..9af4329 100644
--- a/src/output/amgc_output_typedef.c
+++ b/src/output/amgc_output_typedef.c
@@ -51,6 +51,9 @@ int amgc_output_typedef(
 		case TYPE_ATOMIC:
 			ret = output_atomic_typedef(aentity,fout);
 			break;
+
+		default:
+			ret = -1;
 	}
 
 	if (ret)