diff --git a/assets/parser.c.erb b/assets/parser.c.erb
index 9440bf3..fc5b1cf 100644
--- a/assets/parser.c.erb
+++ b/assets/parser.c.erb
@@ -531,7 +531,7 @@ size_t <%= @grammar.prefix %>lex(<%= @grammar.prefix %>context_t * context, <%=
  *************************************************************************/
 
 /** Reduce ID type. */
-alias reduce_id_t = <%= get_type_for(@parser.reduce_table.size) %>;
+typedef <%= get_type_for(@parser.reduce_table.size) %> = reduce_id_t;
 
 /**
  * A symbol ID can hold either a token ID or a rule set ID.
@@ -539,16 +539,16 @@ alias reduce_id_t = <%= get_type_for(@parser.reduce_table.size) %>;
  * Token IDs and rule set IDs share the same namespace, with rule set IDs
  * beginning after token IDs end.
  */
-alias symbol_id_t = <%= get_type_for(@parser.rule_sets.map(&:last).map(&:id).max) %>;
+typedef <%= get_type_for(@parser.rule_sets.map(&:last).map(&:id).max) %> symbol_id_t;
 
 /** Parser state ID type. */
-alias parser_state_id_t = <%= get_type_for(@parser.state_table.size) %>;
+typedef <%= get_type_for(@parser.state_table.size) %> parser_state_id_t;
 
 /** Parser rule ID type. */
-alias rule_id_t = <%= get_type_for(@grammar.rules.size) %>;
+typedef <%= get_type_for(@grammar.rules.size) %> rule_id_t;
 
 /** Parser shift ID type. */
-alias shift_id_t = <%= get_type_for(@parser.shift_table.size) %>;
+typedef <%= get_type_for(@parser.shift_table.size) %> shift_id_t;
 
 /** Shift table entry. */
 typedef struct