diff --git a/vvp/parse.y b/vvp/parse.y
index d51c7ab2b..33af4861f 100644
--- a/vvp/parse.y
+++ b/vvp/parse.y
@@ -688,6 +688,9 @@ statement
   | T_LABEL K_EXPORT T_SYMBOL ';'
       { compile_island_export($1, $3); }
 
+  | K_TRAN T_SYMBOL ',' T_SYMBOL T_SYMBOL ';'
+      { compile_island_tranif(0, $2, $4, $5, 0); }
+
   | K_TRANIF0 T_SYMBOL ',' T_SYMBOL T_SYMBOL ',' T_SYMBOL ';'
       { compile_island_tranif(0, $2, $4, $5, $7); }
 
diff --git a/vvp/vvp_island.cc b/vvp/vvp_island.cc
index 2188fe4e7..07f78a563 100644
--- a/vvp/vvp_island.cc
+++ b/vvp/vvp_island.cc
@@ -490,14 +490,18 @@ void compile_island_tranif(int sense, char*island, char*pa, char*pb, char*pe)
       else
 	    br->active_high = false;
 
-      br->en = use_island->find_port(pe);
-      assert(br->en);
+      if (pe == 0) {
+	    br->en = 0;
+      } else {
+	    br->en = use_island->find_port(pe);
+	    assert(br->en);
+	    free(pe);
+      }
 
       use_island->add_branch(br, pa, pb);
 
       free(pa);
       free(pb);
-      free(pe);
 }
 
 void compile_island_cleanup(void)