diff --git a/tests/ampctl.c b/tests/ampctl.c
index 9c54b0f4b..facb707e9 100644
--- a/tests/ampctl.c
+++ b/tests/ampctl.c
@@ -24,7 +24,7 @@
  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  */
-#include "hamlibdatetime.h"
+#include <hamlibdatetime.h>
 
 #ifdef HAVE_CONFIG_H
 #  include "config.h"
diff --git a/tests/rigctl.c b/tests/rigctl.c
index 5c482ab74..a23d0696a 100644
--- a/tests/rigctl.c
+++ b/tests/rigctl.c
@@ -23,7 +23,7 @@
  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  */
-#include "hamlibdatetime.h"
+#include <hamlibdatetime.h>
 
 #ifdef HAVE_CONFIG_H
 #  include "config.h"
diff --git a/tests/rigctld.c b/tests/rigctld.c
index 7d312944f..4d1e24957 100644
--- a/tests/rigctld.c
+++ b/tests/rigctld.c
@@ -71,7 +71,7 @@
 #endif
 
 #include <hamlib/rig.h>
-#include "hamlibdatetime.h"
+#include <hamlibdatetime.h>
 #include "misc.h"
 #include "iofunc.h"
 #include "serial.h"
diff --git a/tests/rotctl.c b/tests/rotctl.c
index dbcae7486..68f6b7a51 100644
--- a/tests/rotctl.c
+++ b/tests/rotctl.c
@@ -23,7 +23,7 @@
  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  */
-#include "hamlibdatetime.h"
+#include <hamlibdatetime.h>
 
 #ifdef HAVE_CONFIG_H
 #  include "config.h"