diff --git a/src/emu/ovni/mark.c b/src/emu/ovni/mark.c
index 3eb123b..950ae00 100644
--- a/src/emu/ovni/mark.c
+++ b/src/emu/ovni/mark.c
@@ -147,7 +147,7 @@ create_mark_type(struct ovni_mark_emu *m, long type, enum chan_type ctype, const
 	struct mark_type *t = find_mark_type(m, type);
 
 	if (t != NULL) {
-		err("mark type %d already defined", type);
+		err("mark type %ld already defined", type);
 		return NULL;
 	}
 
@@ -627,7 +627,7 @@ int
 mark_event(struct emu *emu)
 {
 	if (emu->ev->payload_size != 8 + 4) {
-		err("unexpected payload size %d", emu->ev->payload_size);
+		err("unexpected payload size %zd", emu->ev->payload_size);
 		return -1;
 	}
 
diff --git a/src/rt/ovni.c b/src/rt/ovni.c
index f9fa567..2ce748c 100644
--- a/src/rt/ovni.c
+++ b/src/rt/ovni.c
@@ -1151,7 +1151,7 @@ ovni_mark_label(int32_t type, int64_t value, const char *label)
 		die("label '%s' already defined", label);
 
 	if (json_object_dotset_string(meta, key, label) != 0)
-		die("json_object_dotset_string() failed", type);
+		die("json_object_dotset_string() failed");
 }
 
 /**