diff --git a/src/search/tasks/root_task.cc b/src/search/tasks/root_task.cc
index e2b7be489a..c8807701e2 100644
--- a/src/search/tasks/root_task.cc
+++ b/src/search/tasks/root_task.cc
@@ -179,7 +179,8 @@ void ExplicitOperator::read_pre_post(
         utils::TaskParser &task_parser, bool is_axiom) {
     bool read_from_single_line = !is_axiom;
     vector<FactPair> conditions = read_facts(task_parser, read_from_single_line);
-    int var = task_parser.read_int("variable affected by " + is_axiom ? "axiom" : "effect");
+    string source = is_axiom ? "axiom" : "effect";
+    int var = task_parser.read_int("variable affected by " + source);
     int value_pre = task_parser.read_int("variable value precondition");
     int value_post = task_parser.read_int("variable value postcondition");
     task_parser.confirm_end_of_line();
diff --git a/src/search/utils/task_parser.cc b/src/search/utils/task_parser.cc
index 6a1067ff12..790636cadb 100644
--- a/src/search/utils/task_parser.cc
+++ b/src/search/utils/task_parser.cc
@@ -18,7 +18,7 @@ TaskParser::TaskParser(istream &stream)
 }
 
 void TaskParser::find_next_line(bool throw_error_on_failure) {
-    assert(may_start_line); // We probably forgot a confirm_end_of_line.
+    assert(may_start_line()); // We probably forgot a confirm_end_of_line.
     string next_line;
     while (!stream.eof()) {
         getline(stream, next_line);
@@ -85,7 +85,7 @@ int TaskParser::read_int(const string &message) {
     return parse_int(token, message);
 }
 
-string TaskParser::read_line(const string &message) {
+string TaskParser::read_line(const string &/*message*/) {
     find_next_line(true);
     return line;
 }
diff --git a/src/search/utils/task_parser.h b/src/search/utils/task_parser.h
index 34b1cb55ec..e2f9c6f66e 100644
--- a/src/search/utils/task_parser.h
+++ b/src/search/utils/task_parser.h
@@ -75,7 +75,7 @@ class TaskParser {
     */
     void confirm_end_of_input();
     // TODO: Should this be public at all? Or should we add a get_line method?
-    void error(const std::string &message) const;
+    NO_RETURN void error(const std::string &message) const;
 };
 }
 #endif