diff --git a/native/src/sepolicy/api.cpp b/native/src/sepolicy/api.cpp
index f894476fb..843f47d22 100644
--- a/native/src/sepolicy/api.cpp
+++ b/native/src/sepolicy/api.cpp
@@ -54,17 +54,26 @@ static inline void expand(F &&f, T &&...args) {
     f(std::forward<T>(args)...);
 }
 
+template<typename ...T>
+static inline void expand(const Str &s, T &&...args) {
+    char buf[64];
+    if (s.length() >= sizeof(buf)) return;
+    if (s.empty()) {
+        expand(std::forward<T>(args)..., (char *) nullptr);
+    } else {
+        memcpy(buf, s.data(), s.length());
+        buf[s.length()] = '\0';
+        expand(std::forward<T>(args)..., buf);
+    }
+}
+
 template<typename ...T>
 static inline void expand(const StrVec &vec, T &&...args) {
     if (vec.empty()) {
         expand(std::forward<T>(args)..., (char *) nullptr);
     } else {
-        char buf[64];
         for (auto &s : vec) {
-            if (s.length() >= sizeof(buf)) continue;
-            memcpy(buf, s.data(), s.length());
-            buf[s.length()] = '\0';
-            expand(std::forward<T>(args)..., buf);
+            expand(s, std::forward<T>(args)...);
         }
     }
 }
@@ -76,15 +85,6 @@ static inline void expand(const Xperms &vec, T &&...args) {
     }
 }
 
-template<typename ...T>
-static inline void expand(const Str &s, T &&...args) {
-    char buf[64];
-    if (s.length() >= sizeof(buf)) return;
-    memcpy(buf, s.data(), s.length());
-    buf[s.length()] = '\0';
-    expand(std::forward<T>(args)..., buf);
-}
-
 void sepolicy::allow(StrVec src, StrVec tgt, StrVec cls, StrVec perm) {
     expand(src, tgt, cls, perm, [this](auto ...args) {
         print_rule("allow", args...);
@@ -148,15 +148,14 @@ void sepolicy::attribute(Str name) {
     });
 }
 
-void sepolicy::type_transition(Str src, Str tgt, Str cls, Str def, StrVec obj) {
-    auto obj_str = obj.empty() ? std::string() : std::string(obj[0]);
-    auto o = obj.empty() ? nullptr : obj_str.data();
-    expand(src, tgt, cls, def, [this, &o](auto ...args) {
-        print_rule("type_transition", args..., o);
+void sepolicy::type_transition(Str src, Str tgt, Str cls, Str def, Str obj) {
+    expand(src, tgt, cls, def, obj, [this](auto s, auto t, auto c, auto d, auto o) {
         if (o) {
-            impl->add_filename_trans(args..., o);
+            print_rule("type_transition", s, t, c, d, o);
+            impl->add_filename_trans(s, t, c, d, o);
         } else {
-            impl->add_type_rule(args..., AVTAB_TRANSITION);
+            print_rule("type_transition", s, t, c, d);
+            impl->add_type_rule(s, t, c, d, AVTAB_TRANSITION);
         }
     });
 }
diff --git a/native/src/sepolicy/include/sepolicy.hpp b/native/src/sepolicy/include/sepolicy.hpp
index 43f580710..582d5a151 100644
--- a/native/src/sepolicy/include/sepolicy.hpp
+++ b/native/src/sepolicy/include/sepolicy.hpp
@@ -62,7 +62,7 @@ struct sepolicy {
     void dontauditxperm(StrVec src, StrVec tgt, StrVec cls, Xperms xperm);
 
     // Type rules
-    void type_transition(Str src, Str tgt, Str cls, Str def, StrVec obj);
+    void type_transition(Str src, Str tgt, Str cls, Str def, Str obj);
     void type_change(Str src, Str tgt, Str cls, Str def);
     void type_member(Str src, Str tgt, Str cls, Str def);
 
diff --git a/native/src/sepolicy/lib.rs b/native/src/sepolicy/lib.rs
index ccd72f99c..9c44dbfed 100644
--- a/native/src/sepolicy/lib.rs
+++ b/native/src/sepolicy/lib.rs
@@ -74,14 +74,7 @@ mod ffi {
         #[cxx_name = "type"]
         fn type_(self: Pin<&mut sepolicy>, t: &str, a: Vec<&str>);
         fn attribute(self: Pin<&mut sepolicy>, t: &str);
-        fn type_transition(
-            self: Pin<&mut sepolicy>,
-            s: &str,
-            t: &str,
-            c: &str,
-            d: &str,
-            o: Vec<&str>,
-        );
+        fn type_transition(self: Pin<&mut sepolicy>, s: &str, t: &str, c: &str, d: &str, o: &str);
         fn type_change(self: Pin<&mut sepolicy>, s: &str, t: &str, c: &str, d: &str);
         fn type_member(self: Pin<&mut sepolicy>, s: &str, t: &str, c: &str, d: &str);
         fn genfscon(self: Pin<&mut sepolicy>, s: &str, t: &str, c: &str);
diff --git a/native/src/sepolicy/statement.rs b/native/src/sepolicy/statement.rs
index c1b026904..a8aa182d6 100644
--- a/native/src/sepolicy/statement.rs
+++ b/native/src/sepolicy/statement.rs
@@ -257,9 +257,9 @@ fn exec_statement(sepolicy: Pin<&mut sepolicy>, tokens: &mut Tokens) -> LoggedRe
             match action {
                 Token::TT => {
                     let o = if tokens.peek().is_none() {
-                        vec![]
+                        ""
                     } else {
-                        vec![parse_id(tokens)?]
+                        parse_id(tokens)?
                     };
                     sepolicy.type_transition(s, t, c, d, o)
                 }