diff --git a/server/gc/seaf-fsck.c b/server/gc/seaf-fsck.c
index 64b5800..d57f6db 100644
--- a/server/gc/seaf-fsck.c
+++ b/server/gc/seaf-fsck.c
@@ -26,6 +26,7 @@ static const struct option long_opts[] = {
     { "config-file", required_argument, NULL, 'c', },
     { "central-config-dir", required_argument, NULL, 'F' },
     { "seafdir", required_argument, NULL, 'd', },
+    { 0, 0, 0, 0, },
 };
 
 static void usage ()
diff --git a/server/gc/seaf-migrate.c b/server/gc/seaf-migrate.c
index 7d0ceae..2d66b27 100644
--- a/server/gc/seaf-migrate.c
+++ b/server/gc/seaf-migrate.c
@@ -25,6 +25,7 @@ static const struct option long_opts[] = {
     { "config-file", required_argument, NULL, 'c', },
     { "central-config-dir", required_argument, NULL, 'F' },
     { "seafdir", required_argument, NULL, 'd', },
+    { 0, 0, 0, 0, },
 };
 
 static int
diff --git a/server/gc/seafserv-gc.c b/server/gc/seafserv-gc.c
index b1594b4..77965a2 100644
--- a/server/gc/seafserv-gc.c
+++ b/server/gc/seafserv-gc.c
@@ -28,6 +28,7 @@ static const struct option long_opts[] = {
     { "verbose", no_argument, NULL, 'V' },
     { "dry-run", no_argument, NULL, 'D' },
     { "rm-deleted", no_argument, NULL, 'r' },
+    { 0, 0, 0, 0 },
 };
 
 static void usage ()