diff --git a/lib/slave_config.c b/lib/slave_config.c
index 4ac132a9..132158df 100644
--- a/lib/slave_config.c
+++ b/lib/slave_config.c
@@ -875,7 +875,7 @@ int ecrt_slave_config_flag(ec_slave_config_t *sc, const char *key,
         return -ENOMEM;
     }
 
-    strcpy(io.key, key);
+    strcpy(io.key, key); // no strncpy, buffer is alloc'ed with strlen
     io.value = value;
 
     ret = ioctl(sc->master->fd, EC_IOCTL_SC_FLAG, &io);
diff --git a/master/flag.c b/master/flag.c
index 50512811..652d35b1 100644
--- a/master/flag.c
+++ b/master/flag.c
@@ -47,7 +47,7 @@ int ec_flag_init(
         return -ENOMEM;
     }
 
-    strcpy(flag->key, key);
+    strcpy(flag->key, key); // no strncpy, buffer is alloc'ed with strlen
     flag->value = value;
     return 0;
 }