diff --git a/src/tests/basic/test_basic_checks.c b/src/tests/basic/test_basic_checks.c
index 1db7f3ad..8533172f 100644
--- a/src/tests/basic/test_basic_checks.c
+++ b/src/tests/basic/test_basic_checks.c
@@ -26,7 +26,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <microhttpd2.h>
+#include "microhttpd2.h"
 
 /* Helper macros */
 
diff --git a/src/tests/client_server/libtest.h b/src/tests/client_server/libtest.h
index 20c43247..fc661baa 100644
--- a/src/tests/client_server/libtest.h
+++ b/src/tests/client_server/libtest.h
@@ -29,7 +29,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <microhttpd2.h>
+#include "microhttpd2.h"
 
 /**
  * Information about the current phase.
diff --git a/src/tests/client_server/test_client_server.c b/src/tests/client_server/test_client_server.c
index 3d22c494..9dbce098 100644
--- a/src/tests/client_server/test_client_server.c
+++ b/src/tests/client_server/test_client_server.c
@@ -23,7 +23,7 @@
  * @brief  test with client against server
  * @author Christian Grothoff
  */
-#include <microhttpd2.h>
+#include "microhttpd2.h"
 #include "mhd_config.h"
 #include "libtest.h"
 
diff --git a/src/tests/client_server/test_postprocessor.c b/src/tests/client_server/test_postprocessor.c
index b8e990f2..ab6cf29d 100644
--- a/src/tests/client_server/test_postprocessor.c
+++ b/src/tests/client_server/test_postprocessor.c
@@ -23,7 +23,7 @@
  * @brief  test with client against server
  * @author Christian Grothoff
  */
-#include <microhttpd2.h>
+#include "microhttpd2.h"
 #include "mhd_config.h"
 #include "libtest.h"