diff --git a/src/main.c b/src/main.c
index 25a6c23d..e3429ff7 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1458,7 +1458,7 @@ static void syserr_cb(const char *msg)
 
 extern char secmod_socket_file_name_socket_file[_POSIX_PATH_MAX];
 
-int main(int argc, char **argv)
+int main(int argc, char *argv[])
 {
 	int e;
 	struct listener_st *ltmp = NULL;
diff --git a/src/occtl/occtl.c b/src/occtl/occtl.c
index f4263603..b0201099 100644
--- a/src/occtl/occtl.c
+++ b/src/occtl/occtl.c
@@ -541,7 +541,7 @@ static int single_cmd(int argc, char **argv, void *pool, const char *file,
 	return ret;
 }
 
-int main(int argc, char **argv)
+int main(int argc, char *argv[])
 {
 	char *line = NULL;
 	CONN_TYPE *conn;
diff --git a/src/ocpasswd/ocpasswd.c b/src/ocpasswd/ocpasswd.c
index 54cb9ab6..ddcfbc2c 100644
--- a/src/ocpasswd/ocpasswd.c
+++ b/src/ocpasswd/ocpasswd.c
@@ -419,7 +419,7 @@ static void version(void)
 #define FLAG_LOCK (1 << 1)
 #define FLAG_UNLOCK (1 << 2)
 
-int main(int argc, char **argv)
+int main(int argc, char *argv[])
 {
 	int ret, c;
 	const char *username = NULL;
diff --git a/src/worker.c b/src/worker.c
index 42da038b..dba600ba 100644
--- a/src/worker.c
+++ b/src/worker.c
@@ -53,7 +53,7 @@ static int set_ws_from_env(worker_st *ws);
 
 extern char secmod_socket_file_name_socket_file[_POSIX_PATH_MAX];
 
-int main(int argc, char **argv)
+int main(int argc, char *argv[])
 {
 	int ret, flags;
 	void *worker_pool;
diff --git a/tests/cstp-recv.c b/tests/cstp-recv.c
index 2f1aa117..1bfa2f23 100644
--- a/tests/cstp-recv.c
+++ b/tests/cstp-recv.c
@@ -91,7 +91,7 @@ void receiver(int fd)
 	}
 }
 
-int main(int argc, char **argv)
+int main(int argc, char *argv[])
 {
 	int sockets[2];
 	pid_t child;
diff --git a/tests/generate_oidc_test_data.c b/tests/generate_oidc_test_data.c
index 1eb37f10..0da46dd8 100644
--- a/tests/generate_oidc_test_data.c
+++ b/tests/generate_oidc_test_data.c
@@ -261,7 +261,7 @@ void generate_config_files(const char *output_folder, cjose_jwk_t *key,
 	json_decref(keys);
 }
 
-int main(int argc, char **argv)
+int main(void)
 {
 	char working_directory[1024];
 	static const char audience[] = "SomeAudience";
diff --git a/tests/proxyproto-v1.c b/tests/proxyproto-v1.c
index 7df4ffe7..440666fb 100644
--- a/tests/proxyproto-v1.c
+++ b/tests/proxyproto-v1.c
@@ -133,7 +133,7 @@ static unsigned int try(const char *src, unsigned int src_port, const char *dst,
 	return 1;
 }
 
-int main(int argc, char **argv)
+int main(void)
 {
 	assert(try("127.0.0.1", 99, "127.0.0.1", 100) == 1);
 	assert(try("192.168.5.1", 1099, "172.52.3.1", 3100) == 1);