diff --git a/yacc/reader.c b/yacc/reader.c
index cf6d7021d..573a9744a 100644
--- a/yacc/reader.c
+++ b/yacc/reader.c
@@ -1336,6 +1336,7 @@ loop:
         fprintf(f, " : '%s))\n", plhs[nrules]->name);
       if (sflag)
         fprintf(f, "\n");
+      FREE(a_line);
       return;
     }
     putc(c, f);