diff --git a/targets/TARGET_Maxim/TARGET_MAX32620C/mxc/lp.c b/targets/TARGET_Maxim/TARGET_MAX32620C/mxc/lp.c
index d0d26c1c01..c16343eee5 100644
--- a/targets/TARGET_Maxim/TARGET_MAX32620C/mxc/lp.c
+++ b/targets/TARGET_Maxim/TARGET_MAX32620C/mxc/lp.c
@@ -179,7 +179,7 @@ int LP_ConfigGPIOWakeUpDetect(const gpio_cfg_t *gpio, unsigned int act_high, lp_
     return result;
 }
 
-uint8_t LP_IsGPIOWakeUpSource(const gpio_cfg_t *gpio)
+int LP_IsGPIOWakeUpSource(const gpio_cfg_t *gpio)
 {
     uint8_t gpioWokeUp = 0;
 
diff --git a/targets/TARGET_Maxim/TARGET_MAX32620C/mxc/lp.h b/targets/TARGET_Maxim/TARGET_MAX32620C/mxc/lp.h
index 55487f5a8e..521996c7ec 100644
--- a/targets/TARGET_Maxim/TARGET_MAX32620C/mxc/lp.h
+++ b/targets/TARGET_Maxim/TARGET_MAX32620C/mxc/lp.h
@@ -138,7 +138,7 @@ int LP_ClearGPIOWakeUpDetect(const gpio_cfg_t *gpio);
  *          nonzero = at least one of the gpio passed in triggered a wake up
  *                    the bit set represents which pin is the wake up source
  */
-uint8_t LP_IsGPIOWakeUpSource(const gpio_cfg_t *gpio);
+int LP_IsGPIOWakeUpSource(const gpio_cfg_t *gpio);
 
 /**
  * @brief   Wake on USB plug or unplug
diff --git a/targets/TARGET_Maxim/TARGET_MAX32625/mxc/lp.c b/targets/TARGET_Maxim/TARGET_MAX32625/mxc/lp.c
index fd1a0889e3..ce8944d478 100644
--- a/targets/TARGET_Maxim/TARGET_MAX32625/mxc/lp.c
+++ b/targets/TARGET_Maxim/TARGET_MAX32625/mxc/lp.c
@@ -178,7 +178,7 @@ int LP_ConfigGPIOWakeUpDetect(const gpio_cfg_t *gpio, unsigned int act_high, lp_
     return result;
 }
 
-uint8_t LP_IsGPIOWakeUpSource(const gpio_cfg_t *gpio)
+int LP_IsGPIOWakeUpSource(const gpio_cfg_t *gpio)
 {
     uint8_t gpioWokeUp = 0;
 
diff --git a/targets/TARGET_Maxim/TARGET_MAX32625/mxc/lp.h b/targets/TARGET_Maxim/TARGET_MAX32625/mxc/lp.h
index 1c1e73846e..4a5017fdea 100644
--- a/targets/TARGET_Maxim/TARGET_MAX32625/mxc/lp.h
+++ b/targets/TARGET_Maxim/TARGET_MAX32625/mxc/lp.h
@@ -138,7 +138,7 @@ int LP_ClearGPIOWakeUpDetect(const gpio_cfg_t *gpio);
  *          nonzero = at least one of the gpio passed in triggered a wake up
  *                    the bit set represents which pin is the wake up source
  */
-uint8_t LP_IsGPIOWakeUpSource(const gpio_cfg_t *gpio);
+int LP_IsGPIOWakeUpSource(const gpio_cfg_t *gpio);
 
 /**
  * @brief   Wake on USB plug or unplug