diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index dcb4009e2f..6fea00869e 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -4914,6 +4914,7 @@ static abi_long do_ioctl_ifconf(const IOCTLEntry *ie, uint8_t *buf_temp,
     struct ifconf *host_ifconf;
     uint32_t outbufsz;
     const argtype ifreq_arg_type[] = { MK_STRUCT(STRUCT_sockaddr_ifreq) };
+    const argtype ifreq_max_type[] = { MK_STRUCT(STRUCT_ifmap_ifreq) };
     int target_ifreq_size;
     int nb_ifreq;
     int free_buf = 0;
@@ -4937,7 +4938,7 @@ static abi_long do_ioctl_ifconf(const IOCTLEntry *ie, uint8_t *buf_temp,
 
     host_ifconf = (struct ifconf *)(unsigned long)buf_temp;
     target_ifc_buf = (abi_long)(unsigned long)host_ifconf->ifc_buf;
-    target_ifreq_size = thunk_type_size(ifreq_arg_type, 0);
+    target_ifreq_size = thunk_type_size(ifreq_max_type, 0);
 
     if (target_ifc_buf != 0) {
         target_ifc_len = host_ifconf->ifc_len;