diff --git a/src/con.c b/src/con.c
index ad5025a9..70c7d7f5 100644
--- a/src/con.c
+++ b/src/con.c
@@ -1573,6 +1573,10 @@ char *con_get_tree_representation(Con *con) {
         buf = sstrdup("T[");
     else if (con->layout == L_STACKED)
         buf = sstrdup("S[");
+    else {
+        ELOG("BUG: Code not updated to account for new layout type\n");
+        assert(false);
+    }
 
     /* 2) append representation of children */
     Con *child;