diff --git a/src/error.c b/src/error.c
index 3bcadde..9f1fbd7 100644
--- a/src/error.c
+++ b/src/error.c
@@ -19,6 +19,7 @@
  * 02110-1301, USA.
  */
 
+#include "config.h"
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
diff --git a/src/log.c b/src/log.c
index 1f04b34..7850381 100644
--- a/src/log.c
+++ b/src/log.c
@@ -19,6 +19,7 @@
  * 02110-1301, USA.
  */
 
+#include "config.h"
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
diff --git a/src/main.c b/src/main.c
index d379f98..3d57627 100644
--- a/src/main.c
+++ b/src/main.c
@@ -19,6 +19,7 @@
  * 02110-1301, USA.
  */
 
+#include "config.h"
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
diff --git a/src/options.c b/src/options.c
index 7eb964b..d1dc5e6 100644
--- a/src/options.c
+++ b/src/options.c
@@ -19,6 +19,7 @@
  * 02110-1301, USA.
  */
 
+#include "config.h"
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <string.h>
@@ -28,7 +29,6 @@
 #include <getopt.h>
 #include <termios.h>
 #include <limits.h>
-#include "config.h"
 #include "tio/options.h"
 #include "tio/error.h"
 
diff --git a/src/time.c b/src/time.c
index fd609b8..0acc9f8 100644
--- a/src/time.c
+++ b/src/time.c
@@ -19,6 +19,7 @@
  * 02110-1301, USA.
  */
 
+#include "config.h"
 #include <stdio.h>
 #include <stdlib.h>
 #include <time.h>
diff --git a/src/tty.c b/src/tty.c
index fe4e762..ff6f7ae 100644
--- a/src/tty.c
+++ b/src/tty.c
@@ -19,6 +19,7 @@
  * 02110-1301, USA.
  */
 
+#include "config.h"
 #include <stdio.h>
 #include <unistd.h>
 #include <string.h>