diff --git a/src/sockaddr_str.c b/src/sockaddr_str.c
index 70927a7..9f1e897 100644
--- a/src/sockaddr_str.c
+++ b/src/sockaddr_str.c
@@ -184,38 +184,6 @@
 	return AF_UNSPEC;
 }
 
-/*! Guess whether struct sockaddr with AF_UNSPEC family has valid IPv4 or IPv6 address.
- * The IPv6 is tried first to take into account "IPv4 mapped addresses".
- * \param[in] src  Generic struct sockaddr pointer.
- * \return AF_INET or AF_INET6, AF_UNSPEC or original sa_family which are unsigned type according to <sys/socket.h>.
- */
-unsigned osmo_sockaddr_guess_unspec(const struct sockaddr *src)
-{
-	int rc;
-	struct osmo_sockaddr_str sa;
-	struct osmo_sockaddr_str *tmp = &sa;
-	const struct sockaddr_in6 *src6 = (const struct sockaddr_in6 *)src;
-	const struct sockaddr_in *src4 = (const struct sockaddr_in *)src;
-
-	if (!src)
-		return AF_UNSPEC;
-
-	if (src->sa_family != AF_UNSPEC)
-		return src->sa_family;
-
-	/* IPv6? */
-	rc = osmo_sockaddr_str_from_in6_addr(tmp, &src6->sin6_addr, osmo_ntohs(src6->sin6_port));
-	if (rc == 0 && osmo_ip_str_type(tmp->ip) == AF_INET6)
-		return AF_INET6;
-
-	/* IPv4? */
-	rc = osmo_sockaddr_str_from_in_addr(tmp, &src4->sin_addr, osmo_ntohs(src4->sin_port));
-	if (rc == 0 && osmo_ip_str_type(tmp->ip) == AF_INET)
-		return AF_INET;
-
-	return AF_UNSPEC;
-}
-
 /*! Safely copy the given ip string to sockaddr_str, classify to AF_INET or AF_INET6.
  * Data will be written to sockaddr_str even if an error is returned.
  * \param[out] sockaddr_str  The instance to copy to.
@@ -349,7 +317,7 @@
 		return -ENOSPC;
 	if (!src)
 		return -EINVAL;
-	if (src->sin_family != AF_INET && osmo_sockaddr_guess_unspec((const struct sockaddr *)src) != AF_INET)
+	if (src->sin_family != AF_INET)
 		return -EINVAL;
 	return osmo_sockaddr_str_from_in_addr(sockaddr_str, &src->sin_addr, osmo_ntohs(src->sin_port));
 }
@@ -365,7 +333,7 @@
 		return -ENOSPC;
 	if (!src)
 		return -EINVAL;
-	if (src->sin6_family != AF_INET6 && osmo_sockaddr_guess_unspec((const struct sockaddr *)src) != AF_INET6)
+	if (src->sin6_family != AF_INET6)
 		return -EINVAL;
 	return osmo_sockaddr_str_from_in6_addr(sockaddr_str, &src->sin6_addr, osmo_ntohs(src->sin6_port));
 }