1 files changed, 2 insertions, 0 deletions
diff --git a/doc/flex.texi b/doc/flex.texi
index 825add3..c7edce6 100644
--- a/doc/flex.texi
+++ b/doc/flex.texi
@@ -4910,8 +4910,10 @@ custom allocator through @code{yyextra}.
 %option reentrant
 
 /* Initialize the allocator. */
+%{
 #define YY_EXTRA_TYPE  struct allocator*
 #define YY_USER_INIT  yyextra = allocator_create();
+%}
 
 %%
 .|\n   ;