diff --git a/admin/halog/halog.c b/admin/halog/halog.c
index f2b9dd7e7..884a606e8 100644
--- a/admin/halog/halog.c
+++ b/admin/halog/halog.c
@@ -410,7 +410,7 @@ struct timer *insert_timer(struct eb_root *r, struct timer **alloc, int v)
 	struct eb32_node *n;
 
 	if (!t) {
-		t = calloc(sizeof(*t), 1);
+		t = calloc(1, sizeof(*t));
 		if (unlikely(!t)) {
 			fprintf(stderr, "%s: not enough memory\n", __FUNCTION__);
 			exit(1);
@@ -438,7 +438,7 @@ struct timer *insert_value(struct eb_root *r, struct timer **alloc, int v)
 	struct eb32_node *n;
 
 	if (!t) {
-		t = calloc(sizeof(*t), 1);
+		t = calloc(1, sizeof(*t));
 		if (unlikely(!t)) {
 			fprintf(stderr, "%s: not enough memory\n", __FUNCTION__);
 			exit(1);
diff --git a/dev/udp/udp-perturb.c b/dev/udp/udp-perturb.c
index 8a851fc49..55d177343 100644
--- a/dev/udp/udp-perturb.c
+++ b/dev/udp/udp-perturb.c
@@ -489,7 +489,7 @@ int main(int argc, char **argv)
 	if (addr_to_ss(argv[optind+1], &srv_addr, &err) < 0)
 		die(1, "parsing server address: %s\n", err.msg);
 
-	pfd = calloc(sizeof(struct pollfd), MAXCONN + 1);
+	pfd = calloc(MAXCONN + 1, sizeof(struct pollfd));
 	if (!pfd)
 		die(1, "out of memory\n");
 
diff --git a/src/debug.c b/src/debug.c
index e69a82743..d1526e1d4 100644
--- a/src/debug.c
+++ b/src/debug.c
@@ -1293,7 +1293,7 @@ static int debug_parse_delay_inj(char **args, char *payload, struct appctx *appc
 
 	_HA_ATOMIC_INC(&debug_commands_issued);
 
-	tctx = calloc(sizeof(*tctx), 2);
+	tctx = calloc(2, sizeof(*tctx));
 	if (!tctx)
 		goto fail;
 
@@ -1427,7 +1427,7 @@ static int debug_parse_cli_sched(char **args, char *payload, struct appctx *appc
 			*(uint8_t *)ptr = new;
 	}
 
-	tctx = calloc(sizeof(*tctx), count + 2);
+	tctx = calloc(count + 2, sizeof(*tctx));
 	if (!tctx)
 		goto fail;