diff --git a/src/base128.c b/src/base128.c
index 32a29f8..7ce6642 100644
--- a/src/base128.c
+++ b/src/base128.c
@@ -28,6 +28,10 @@
  *	1000 8
  */
 
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
diff --git a/src/base32.c b/src/base32.c
index 8731a92..c25e0a4 100644
--- a/src/base32.c
+++ b/src/base32.c
@@ -15,6 +15,10 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
diff --git a/src/base64.c b/src/base64.c
index 5218c09..a8e9e1c 100644
--- a/src/base64.c
+++ b/src/base64.c
@@ -15,6 +15,10 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
diff --git a/src/client.c b/src/client.c
index 0e1674f..f94f5e7 100644
--- a/src/client.c
+++ b/src/client.c
@@ -14,6 +14,10 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <ctype.h>
 #include <stdio.h>
 #include <stdint.h>
diff --git a/src/common.c b/src/common.c
index 5f202da..909d1f1 100644
--- a/src/common.c
+++ b/src/common.c
@@ -14,6 +14,10 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <time.h>
 #include <sys/types.h>
 #include <sys/param.h>
diff --git a/src/dns.c b/src/dns.c
index bd1257f..dccea3a 100644
--- a/src/dns.c
+++ b/src/dns.c
@@ -14,6 +14,10 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <time.h>
 #include <stdio.h>
 #include <stdint.h>
diff --git a/src/encoding.c b/src/encoding.c
index 4b5fb08..5be4089 100644
--- a/src/encoding.c
+++ b/src/encoding.c
@@ -14,6 +14,10 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <string.h>
 #include "common.h"
 #include "encoding.h"
diff --git a/src/fw_query.c b/src/fw_query.c
index 3727f08..3aa12b4 100644
--- a/src/fw_query.c
+++ b/src/fw_query.c
@@ -14,6 +14,10 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <string.h>
 #include "fw_query.h"
 
diff --git a/src/iodine.c b/src/iodine.c
index 519eac3..5f0fd63 100644
--- a/src/iodine.c
+++ b/src/iodine.c
@@ -14,6 +14,10 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <stdio.h>
 #include <stdint.h>
 #include <stdlib.h>
diff --git a/src/iodined.c b/src/iodined.c
index 8e579bf..62ab7b9 100644
--- a/src/iodined.c
+++ b/src/iodined.c
@@ -14,6 +14,10 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <stdio.h>
 #include <stdint.h>
 #include <stdlib.h>
diff --git a/src/login.c b/src/login.c
index c562050..8641918 100644
--- a/src/login.c
+++ b/src/login.c
@@ -14,6 +14,10 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <string.h>
 #include <sys/types.h>
 
diff --git a/src/read.c b/src/read.c
index f4ad4a8..9fdd656 100644
--- a/src/read.c
+++ b/src/read.c
@@ -14,6 +14,10 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <string.h>
 #include <stdint.h>
 #include <stdlib.h>
diff --git a/src/tun.c b/src/tun.c
index bc5c153..dd24b2d 100644
--- a/src/tun.c
+++ b/src/tun.c
@@ -14,6 +14,10 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
diff --git a/src/user.c b/src/user.c
index f5ad924..2f711eb 100644
--- a/src/user.c
+++ b/src/user.c
@@ -14,6 +14,10 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <stdio.h>
 #include <stdint.h>
 #include <time.h>
diff --git a/src/util.c b/src/util.c
index 7a365ac..6f2a0bc 100644
--- a/src/util.c
+++ b/src/util.c
@@ -14,6 +14,10 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <stdio.h>
 #include "common.h"
 
diff --git a/tests/base32.c b/tests/base32.c
index f007798..7b29fe9 100644
--- a/tests/base32.c
+++ b/tests/base32.c
@@ -14,6 +14,10 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <check.h>
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/tests/base64.c b/tests/base64.c
index a259b23..c32c464 100644
--- a/tests/base64.c
+++ b/tests/base64.c
@@ -14,6 +14,10 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <check.h>
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/tests/common.c b/tests/common.c
index 92f2d4c..2d8122a 100644
--- a/tests/common.c
+++ b/tests/common.c
@@ -1,3 +1,7 @@
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <check.h>
 #include <common.h>
 #include <unistd.h>
diff --git a/tests/dns.c b/tests/dns.c
index 9e89027..04ff190 100644
--- a/tests/dns.c
+++ b/tests/dns.c
@@ -14,6 +14,10 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <check.h>
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/tests/encoding.c b/tests/encoding.c
index ac22452..5804e77 100644
--- a/tests/encoding.c
+++ b/tests/encoding.c
@@ -14,6 +14,10 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <check.h>
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/tests/fw_query.c b/tests/fw_query.c
index 6d23924..0892b88 100644
--- a/tests/fw_query.c
+++ b/tests/fw_query.c
@@ -14,6 +14,10 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <check.h>
 
 #include "fw_query.h"
diff --git a/tests/login.c b/tests/login.c
index 1ef23f4..15bd55d 100644
--- a/tests/login.c
+++ b/tests/login.c
@@ -14,6 +14,10 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <check.h>
 #include <string.h>
 
diff --git a/tests/read.c b/tests/read.c
index f51d0aa..387a223 100644
--- a/tests/read.c
+++ b/tests/read.c
@@ -14,6 +14,10 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
diff --git a/tests/test.c b/tests/test.c
index e897cc2..04549bf 100644
--- a/tests/test.c
+++ b/tests/test.c
@@ -14,6 +14,10 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <check.h>
 #include <stdio.h>
 #include <stdarg.h>
diff --git a/tests/user.c b/tests/user.c
index 00a3a8e..2095429 100644
--- a/tests/user.c
+++ b/tests/user.c
@@ -14,6 +14,10 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <check.h>
 #include <stdio.h>
 #include <string.h>