diff --git a/src/sys/gpio/hasp_gpio.cpp b/src/sys/gpio/hasp_gpio.cpp
index c4a74dba..b4240333 100644
--- a/src/sys/gpio/hasp_gpio.cpp
+++ b/src/sys/gpio/hasp_gpio.cpp
@@ -381,7 +381,7 @@ static inline void gpio_input_state(hasp_gpio_config_t* gpio)
 
 void gpio_output_state(hasp_gpio_config_t* gpio)
 {
-    char payload[32];
+    char payload[40];
     char topic[12];
     char statename[8];