diff --git a/src/lexer.l b/src/lexer.l
index 6e930a1e..2e27a5d4 100644
--- a/src/lexer.l
+++ b/src/lexer.l
@@ -28,6 +28,7 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 
+#include "ac_cfg.h"
 #include "avrdude.h"
 #include "libavrdude.h"
 #include "config.h"
diff --git a/src/update.c b/src/update.c
index 95e1028f..5f00d32d 100644
--- a/src/update.c
+++ b/src/update.c
@@ -25,6 +25,7 @@
 #include <string.h>
 #include <time.h>
 
+#include "ac_cfg.h"
 #include "avrdude.h"
 #include "libavrdude.h"