diff --git a/src/bench.c b/src/bench.c
index e6fe843..23abf92 100644
--- a/src/bench.c
+++ b/src/bench.c
@@ -47,7 +47,7 @@ gt_bench(int argc, char **argv)
         {"precision", "EXPONENT", &precision, argz_ulong},
         {"bufsize", "BYTES", &bufsize, argz_bytes},
         {"duration", "SECONDS", &duration, argz_time},
-        {}};
+        {NULL}};
 
     if (argz(bench_argz, argc, argv))
         return 1;
diff --git a/src/bind.c b/src/bind.c
index f53e579..47e1e0e 100644
--- a/src/bind.c
+++ b/src/bind.c
@@ -128,12 +128,12 @@ gt_bind(int argc, char **argv)
     struct argz mtuz[] = {
         {"auto", NULL, NULL, argz_option},
         {NULL, "BYTES", &mtu, argz_bytes},
-        {}};
+        {NULL}};
 
     struct argz toz[] = {
         {NULL, "IPADDR", &peer_addr, argz_addr},
         {NULL, "PORT", &peer_port, argz_ushort},
-        {}};
+        {NULL}};
 
     struct argz bindz[] = {
         {NULL, "IPADDR", &bind_addr, argz_addr},
@@ -145,7 +145,7 @@ gt_bind(int argc, char **argv)
         {"chacha", NULL, NULL, argz_option},
         {"persist", NULL, NULL, argz_option},
         {"bufsize", "BYTES", &bufsize, argz_bytes},
-        {}};
+        {NULL}};
 
     if (argz(bindz, argc, argv))
         return 1;
diff --git a/src/main.c b/src/main.c
index 04cf3fe..eede535 100644
--- a/src/main.c
+++ b/src/main.c
@@ -74,7 +74,7 @@ main(int argc, char **argv)
         {"keygen", "generate a new secret key", gt_keygen},
         {"path", "manage paths", gt_path},
         {"version", "show version", gt_version},
-        {}};
+        {NULL}};
 
     if (argc < 2)
         return gt_show(argc, argv);
diff --git a/src/path.c b/src/path.c
index 402bf57..fcd0e86 100644
--- a/src/path.c
+++ b/src/path.c
@@ -15,12 +15,12 @@ gt_path(int argc, char **argv)
 
     struct argz actionz[] = {
         {NULL, "IPADDR", &addr, argz_addr},
-        {}};
+        {NULL}};
 
     struct argz pathz[] = {
         {"dev", "NAME", &dev, argz_str},
         {"up|down", NULL, &actionz, argz_option},
-        {}};
+        {NULL}};
 
     if (argz(pathz, argc, argv))
         return 1;
diff --git a/src/set.c b/src/set.c
index 7970051..8a165d2 100644
--- a/src/set.c
+++ b/src/set.c
@@ -82,7 +82,7 @@ gt_set(int argc, char **argv)
         {"mtu", "BYTES", &mtu, argz_bytes},
         {"timeout", "SECONDS", &timeout, argz_time},
         {"timetolerance", "SECONDS", &timetolerance, argz_time},
-        {}};
+        {NULL}};
 
     if (argz(pathz, argc, argv))
         return 1;