diff --git a/.gitignore b/.gitignore
index eb02a035..51f1d410 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 bin/*
 src/lex.yy.c
+src/lex.yy.h
 src/y.tab.c
 src/y.tab.h
 lib/*
diff --git a/src/scan.l b/src/scan.l
index b7d4b456..b52256b8 100644
--- a/src/scan.l
+++ b/src/scan.l
@@ -30,6 +30,7 @@
 %option noinput
 %option nounput
 %option extra-type="struct parser_control *"
+%option header-file="lex.yy.h"
 %option never-interactive
 
   /* comment */