diff --git a/tests/events/main.c b/tests/events/main.c
index 44d4575fde..7b44ece504 100644
--- a/tests/events/main.c
+++ b/tests/events/main.c
@@ -27,6 +27,7 @@
 #include "event.h"
 #include "event/timeout.h"
 #include "event/callback.h"
+#include "xtimer.h"
 
 #define STACKSIZE               THREAD_STACKSIZE_DEFAULT
 #define PRIO                    (THREAD_PRIORITY_MAIN - 1)
diff --git a/tests/gnrc_ipv6_nib/main.c b/tests/gnrc_ipv6_nib/main.c
index a5d93d9a53..2694e6c0a0 100644
--- a/tests/gnrc_ipv6_nib/main.c
+++ b/tests/gnrc_ipv6_nib/main.c
@@ -32,6 +32,7 @@
 #include "net/gnrc/netif/internal.h"
 #include "net/ndp.h"
 #include "sched.h"
+#include "timex.h"
 
 #define _BUFFER_SIZE    (128)
 #define _CUR_HL         (155)
diff --git a/tests/gnrc_ipv6_nib_6ln/main.c b/tests/gnrc_ipv6_nib_6ln/main.c
index b0c77805f2..eaa13747ac 100644
--- a/tests/gnrc_ipv6_nib_6ln/main.c
+++ b/tests/gnrc_ipv6_nib_6ln/main.c
@@ -35,6 +35,7 @@
 #include "net/ndp.h"
 #include "net/sixlowpan/nd.h"
 #include "sched.h"
+#include "timex.h"
 
 #define _BUFFER_SIZE    (196)
 #define _ARO_LTIME      (4224)
diff --git a/tests/pkg_tinydtls_sock_async/dtls-client.c b/tests/pkg_tinydtls_sock_async/dtls-client.c
index 7831bd8ec9..2cafecc18d 100644
--- a/tests/pkg_tinydtls_sock_async/dtls-client.c
+++ b/tests/pkg_tinydtls_sock_async/dtls-client.c
@@ -26,6 +26,7 @@
 #include "net/sock/dtls.h"
 #include "net/ipv6/addr.h"
 #include "net/credman.h"
+#include "timex.h"
 
 #include "tinydtls_common.h"
 #include "tinydtls_keys.h"