diff --git a/sys/include/net/eui_provider.h b/sys/include/net/eui_provider.h
index 44f46a2d9d..a856406815 100644
--- a/sys/include/net/eui_provider.h
+++ b/sys/include/net/eui_provider.h
@@ -75,10 +75,13 @@
  * Recommendations
  * ===============
  *
- * While it is possible to match EUIs with any netdev in a first come, first serve
- * fashion (`NETDEV_ANY`, `NETDEV_INDEX_ANY`) it is recommended to fix the EUI
- * providers to a device and interface to avoid them being used for 'virtual'
- * interfaces.
+ * Do not use `NETDEV_ANY` as EUI device type. Otherwise if you have two
+ * interfaces both will match the same EUI.
+ *
+ * It is however possible to use `NETDEV_INDEX_ANY` if you have multiple
+ * interfaces of the same type and your EUI provider function takes the index
+ * into account (or returns error if the index is out of bounds with the
+ * available ids).
  *
  * Fixed addresses are only guaranteed if the network devices are also fixed.
  * E.g. if you usually have two netdevs and disable the first one at compile-time
@@ -132,7 +135,7 @@ typedef int (*netdev_get_eui64_cb_t)(uint8_t index, eui64_t *addr);
  */
 typedef struct {
     netdev_get_eui48_cb_t provider; /**< function to provide an EUI-48                  */
-    netdev_type_t type;             /**< device type to match or `NETDEV_ANY`           */
+    netdev_type_t type;             /**< device type to match                           */
     uint8_t index;                  /**< device index to match or `NETDEV_INDEX_ANY`    */
 } eui48_conf_t;
 
@@ -141,7 +144,7 @@ typedef struct {
  */
 typedef struct {
     netdev_get_eui64_cb_t provider; /**< function to provide an EUI-64                  */
-    netdev_type_t type;             /**< device type to match or `NETDEV_ANY`           */
+    netdev_type_t type;             /**< device type to match                           */
     uint8_t index;                  /**< device index to match or `NETDEV_INDEX_ANY`    */
 } eui64_conf_t;
 
diff --git a/sys/net/link_layer/eui_provider/eui_provider.c b/sys/net/link_layer/eui_provider/eui_provider.c
index 54e348ff11..95c5446ada 100644
--- a/sys/net/link_layer/eui_provider/eui_provider.c
+++ b/sys/net/link_layer/eui_provider/eui_provider.c
@@ -13,6 +13,7 @@
  * @author  Benjamin Valentin <benjamin.valentin@ml-pa.com>
  */
 
+#include "assert.h"
 #include "eui48_provider_params.h"
 #include "eui64_provider_params.h"
 #include "luid.h"
@@ -23,8 +24,13 @@ void netdev_eui48_get(netdev_t *netdev, eui48_t *addr)
     unsigned i = EUI48_PROVIDER_NUMOF;
     while (i--) {
 #ifdef MODULE_NETDEV_REGISTER
-        if (eui48_conf[i].type != netdev->type &&
-            eui48_conf[i].type != NETDEV_ANY) {
+        /* using NETDEV_ANY causes conflicts if there is another interface
+         * of a different type. Require EUI  providers to be locked to an
+         * interface type for uniqueness.
+         */
+        assert(eui48_conf[i].type != NETDEV_ANY);
+
+        if (eui48_conf[i].type != netdev->type) {
             continue;
         }
 
@@ -48,8 +54,13 @@ void netdev_eui64_get(netdev_t *netdev, eui64_t *addr)
     unsigned i = EUI64_PROVIDER_NUMOF;
     while (i--) {
 #ifdef MODULE_NETDEV_REGISTER
-        if (eui64_conf[i].type != netdev->type &&
-            eui64_conf[i].type != NETDEV_ANY) {
+        /* using NETDEV_ANY causes conflicts if there is another interface
+         * of a different type. Require EUI  providers to be locked to an
+         * interface type for uniqueness.
+         */
+        assert(eui64_conf[i].type != NETDEV_ANY);
+
+        if (eui64_conf[i].type != netdev->type) {
             continue;
         }