diff --git a/sys/include/net/gnrc/netif/ipv6.h b/sys/include/net/gnrc/netif/ipv6.h
index 5953806540..5fb6acbada 100644
--- a/sys/include/net/gnrc/netif/ipv6.h
+++ b/sys/include/net/gnrc/netif/ipv6.h
@@ -18,7 +18,6 @@
 #ifndef NET_GNRC_NETIF_IPV6_H
 #define NET_GNRC_NETIF_IPV6_H
 
-#include <assert.h>
 #include <kernel_defines.h>
 
 #include "evtimer_msg.h"
diff --git a/sys/include/net/sock/ip.h b/sys/include/net/sock/ip.h
index 00c37c9ba8..93f5f2d5ad 100644
--- a/sys/include/net/sock/ip.h
+++ b/sys/include/net/sock/ip.h
@@ -268,7 +268,6 @@
 #ifndef NET_SOCK_IP_H
 #define NET_SOCK_IP_H
 
-#include <assert.h>
 #include <stdint.h>
 #include <stdlib.h>
 #include <sys/types.h>
diff --git a/sys/include/net/sock/udp.h b/sys/include/net/sock/udp.h
index b3c1cbf1f2..5a4360fffc 100644
--- a/sys/include/net/sock/udp.h
+++ b/sys/include/net/sock/udp.h
@@ -268,7 +268,6 @@
 #ifndef NET_SOCK_UDP_H
 #define NET_SOCK_UDP_H
 
-#include <assert.h>
 #include <stdint.h>
 #include <stdlib.h>
 #include <sys/types.h>
diff --git a/sys/include/pm_layered.h b/sys/include/pm_layered.h
index 2d98035a0b..c9e4233fa9 100644
--- a/sys/include/pm_layered.h
+++ b/sys/include/pm_layered.h
@@ -34,7 +34,6 @@
 #ifndef PM_LAYERED_H
 #define PM_LAYERED_H
 
-#include "assert.h"
 #include "periph_cpu.h"
 
 #ifdef __cplusplus
diff --git a/sys/luid/luid.c b/sys/luid/luid.c
index 80555a8376..bb7079409e 100644
--- a/sys/luid/luid.c
+++ b/sys/luid/luid.c
@@ -21,7 +21,6 @@
 #include <stdint.h>
 #include <string.h>
 
-#include "assert.h"
 #include "periph/cpuid.h"
 
 #include "luid.h"
diff --git a/sys/net/gnrc/application_layer/dhcpv6/client_6lbr.c b/sys/net/gnrc/application_layer/dhcpv6/client_6lbr.c
index 3c95c67e47..57e776350d 100644
--- a/sys/net/gnrc/application_layer/dhcpv6/client_6lbr.c
+++ b/sys/net/gnrc/application_layer/dhcpv6/client_6lbr.c
@@ -13,8 +13,6 @@
  * @author  Martine S. Lenders <m.lenders@fu-berlin.de>
  */
 
-#include <assert.h>
-
 #include "event.h"
 #include "log.h"
 #include "net/dhcpv6/client.h"
diff --git a/sys/net/gnrc/transport_layer/tcp/include/gnrc_tcp_common.h b/sys/net/gnrc/transport_layer/tcp/include/gnrc_tcp_common.h
index 2bcd69876c..fa694e234a 100644
--- a/sys/net/gnrc/transport_layer/tcp/include/gnrc_tcp_common.h
+++ b/sys/net/gnrc/transport_layer/tcp/include/gnrc_tcp_common.h
@@ -21,7 +21,6 @@
 #define GNRC_TCP_COMMON_H
 
 #include <stdint.h>
-#include "assert.h"
 #include "kernel_types.h"
 #include "thread.h"
 #include "mutex.h"
diff --git a/sys/progress_bar/progress_bar.c b/sys/progress_bar/progress_bar.c
index 2bec1c5d8c..cdde2d00a9 100644
--- a/sys/progress_bar/progress_bar.c
+++ b/sys/progress_bar/progress_bar.c
@@ -20,7 +20,6 @@
 
 #include <stdio.h>
 #include <inttypes.h>
-#include <assert.h>
 
 #include "progress_bar.h"
 
diff --git a/sys/ztimer/periodic.c b/sys/ztimer/periodic.c
index 5c38fdfd5a..b928409f9c 100644
--- a/sys/ztimer/periodic.c
+++ b/sys/ztimer/periodic.c
@@ -19,7 +19,7 @@
  *
  * @}
  */
-#include <assert.h>
+
 #include <errno.h>
 #include <stdio.h>