diff --git a/components/ulp/lp_core/lp_core/lp_core_print.c b/components/ulp/lp_core/lp_core/lp_core_print.c
index 658768ee36..ca6cd9d19e 100644
--- a/components/ulp/lp_core/lp_core/lp_core_print.c
+++ b/components/ulp/lp_core/lp_core/lp_core_print.c
@@ -266,4 +266,6 @@ int lp_core_printf(const char* format, ...)
     int ret = lp_core_ets_vprintf(lp_uart_send_char, format, ap);
 
     va_end(ap);
+
+    return ret;
 }