diff --git a/pkg/nimble/autoadv/nimble_autoadv.c b/pkg/nimble/autoadv/nimble_autoadv.c
index 32c1b14cd8..590f3fe778 100644
--- a/pkg/nimble/autoadv/nimble_autoadv.c
+++ b/pkg/nimble/autoadv/nimble_autoadv.c
@@ -192,11 +192,11 @@ void nimble_autoadv_start(ble_addr_t *addr)
     if (addr != NULL) {
         mode = BLE_GAP_CONN_MODE_DIR;
     }
-    else if (_cfg.flags && NIMBLE_AUTOADV_FLAG_CONNECTABLE) {
+    else if (_cfg.flags & NIMBLE_AUTOADV_FLAG_CONNECTABLE) {
         mode = BLE_GAP_CONN_MODE_UND;
     }
-    uint8_t disc = (_cfg.flags && NIMBLE_AUTOADV_FLAG_SCANNABLE) ? BLE_GAP_CONN_MODE_DIR
-                                                                 : BLE_GAP_CONN_MODE_UND;
+    uint8_t disc = (_cfg.flags & NIMBLE_AUTOADV_FLAG_SCANNABLE) ? BLE_GAP_CONN_MODE_DIR
+                                                                : BLE_GAP_CONN_MODE_UND;
     struct ble_gap_adv_params advp = {
         .conn_mode = mode,
         .disc_mode = disc,
diff --git a/sys/net/crosslayer/inet_csum/inet_csum.c b/sys/net/crosslayer/inet_csum/inet_csum.c
index abeda848a8..bc07ab5468 100644
--- a/sys/net/crosslayer/inet_csum/inet_csum.c
+++ b/sys/net/crosslayer/inet_csum/inet_csum.c
@@ -14,6 +14,8 @@
 
 #include <inttypes.h>
 #include <stdio.h>
+
+#include "modules.h"
 #include "od.h"
 #include "net/inet_csum.h"
 
diff --git a/sys/net/gnrc/netreg/gnrc_netreg.c b/sys/net/gnrc/netreg/gnrc_netreg.c
index bf26713ac1..e56f0dda13 100644
--- a/sys/net/gnrc/netreg/gnrc_netreg.c
+++ b/sys/net/gnrc/netreg/gnrc_netreg.c
@@ -152,6 +152,13 @@ int gnrc_netreg_register(gnrc_nettype_t type, gnrc_netreg_entry_t *entry)
     }
 
     _gnrc_netreg_acquire_exclusive();
+
+    /* don't add the same entry twice */
+    gnrc_netreg_entry_t *e;
+    LL_FOREACH(netreg[type], e) {
+        assert(entry != e);
+    }
+
     LL_PREPEND(netreg[type], entry);
     _gnrc_netreg_release_exclusive();
 
diff --git a/sys/vfs/vfs.c b/sys/vfs/vfs.c
index 29881fc942..c4eb4dbb0c 100644
--- a/sys/vfs/vfs.c
+++ b/sys/vfs/vfs.c
@@ -23,6 +23,8 @@
 #include <fcntl.h> /* for O_ACCMODE, ..., fcntl */
 #include <unistd.h> /* for STDIN_FILENO, STDOUT_FILENO, STDERR_FILENO */
 
+#include "container.h"
+#include "modules.h"
 #include "vfs.h"
 #include "mutex.h"
 #include "thread.h"