diff --git a/sys/net/gnrc/network_layer/ipv6/nib/_nib-internal.c b/sys/net/gnrc/network_layer/ipv6/nib/_nib-internal.c
index 7bcd2e86ed..bacd4f907e 100644
--- a/sys/net/gnrc/network_layer/ipv6/nib/_nib-internal.c
+++ b/sys/net/gnrc/network_layer/ipv6/nib/_nib-internal.c
@@ -527,7 +527,7 @@ static inline bool _in_dsts(const _nib_offl_entry_t *dst)
 #if IS_ACTIVE(CONFIG_GNRC_IPV6_NIB_MULTIHOP_P6C)
 static inline unsigned _idx_dsts(const _nib_offl_entry_t *dst)
 {
-    return (dst - _dsts) / sizeof(*dst);
+    return (dst - _dsts);
 }
 
 static inline bool _in_abrs(const _nib_abr_entry_t *abr)