diff --git a/tests/multiboot2_print1.c b/tests/multiboot2_print1.c
index a9399be..4785294 100644
--- a/tests/multiboot2_print1.c
+++ b/tests/multiboot2_print1.c
@@ -1,3 +1,7 @@
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <kernaux/multiboot2.h>
 
 #include <assert.h>
diff --git a/tests/multiboot2_print2.c b/tests/multiboot2_print2.c
index 5110a8f..6b9dd20 100644
--- a/tests/multiboot2_print2.c
+++ b/tests/multiboot2_print2.c
@@ -1,3 +1,7 @@
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <kernaux/multiboot2.h>
 
 #include <assert.h>
diff --git a/tests/test_cmdline.c b/tests/test_cmdline.c
index f48368d..3131da7 100644
--- a/tests/test_cmdline.c
+++ b/tests/test_cmdline.c
@@ -1,3 +1,7 @@
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <kernaux/cmdline.h>
 
 #include <assert.h>
diff --git a/tests/test_multiboot2_helpers.c b/tests/test_multiboot2_helpers.c
index b771700..77c2264 100644
--- a/tests/test_multiboot2_helpers.c
+++ b/tests/test_multiboot2_helpers.c
@@ -1,3 +1,7 @@
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <kernaux/multiboot2.h>
 
 #include <assert.h>
diff --git a/tests/test_multiboot2_print.c b/tests/test_multiboot2_print.c
index 42262c4..7cbd479 100644
--- a/tests/test_multiboot2_print.c
+++ b/tests/test_multiboot2_print.c
@@ -1,3 +1,7 @@
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <assert.h>
 
 #define __USE_POSIX2
diff --git a/tests/test_multiboot2_validation.c b/tests/test_multiboot2_validation.c
index 12da064..b112d6b 100644
--- a/tests/test_multiboot2_validation.c
+++ b/tests/test_multiboot2_validation.c
@@ -1,3 +1,7 @@
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <kernaux/multiboot2.h>
 
 #include <assert.h>
diff --git a/tests/test_pfa.c b/tests/test_pfa.c
index baec789..ed4c1ee 100644
--- a/tests/test_pfa.c
+++ b/tests/test_pfa.c
@@ -1,3 +1,7 @@
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <kernaux/pfa.h>
 
 #include <assert.h>
diff --git a/tests/test_printf.c b/tests/test_printf.c
index bda5c4b..68758f6 100644
--- a/tests/test_printf.c
+++ b/tests/test_printf.c
@@ -1,3 +1,7 @@
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <kernaux/printf.h>
 
 #include <assert.h>
diff --git a/tests/test_stdlib.c b/tests/test_stdlib.c
index 8949fb6..981e458 100644
--- a/tests/test_stdlib.c
+++ b/tests/test_stdlib.c
@@ -1,3 +1,7 @@
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <kernaux/stdlib.h>
 
 #include <assert.h>