diff --git a/examples/hcsr04.cxx b/examples/hcsr04.cxx
index 63b3ab1b..52a470ca 100644
--- a/examples/hcsr04.cxx
+++ b/examples/hcsr04.cxx
@@ -43,7 +43,7 @@ sig_handler(int signo)
 
 //! [Interesting]
 void
-interrupt (void) {
+interrupt (void * args) {
     sonar->ackEdgeDetected ();
 }
 
diff --git a/src/hcsr04/hcsr04.cxx b/src/hcsr04/hcsr04.cxx
index 1eb1054f..d2af4bec 100644
--- a/src/hcsr04/hcsr04.cxx
+++ b/src/hcsr04/hcsr04.cxx
@@ -31,7 +31,7 @@
 
 using namespace upm;
 
-HCSR04::HCSR04 (uint8_t triggerPin, uint8_t echoPin, void (*fptr)(void)) {
+HCSR04::HCSR04 (uint8_t triggerPin, uint8_t echoPin, void (*fptr)(void *)) {
     maa_result_t error  = MAA_SUCCESS;
     m_name              = "HCSR04";
 
@@ -50,7 +50,7 @@ HCSR04::HCSR04 (uint8_t triggerPin, uint8_t echoPin, void (*fptr)(void)) {
 
     maa_gpio_dir(m_echoPinCtx, MAA_GPIO_IN);
     gpio_edge_t edge = MAA_GPIO_EDGE_BOTH;
-    maa_gpio_isr (m_echoPinCtx, edge, fptr);
+    maa_gpio_isr (m_echoPinCtx, edge, fptr, NULL);
 }
 
 HCSR04::~HCSR04 () {
diff --git a/src/hcsr04/hcsr04.h b/src/hcsr04/hcsr04.h
index 549ee026..370c58a0 100644
--- a/src/hcsr04/hcsr04.h
+++ b/src/hcsr04/hcsr04.h
@@ -55,7 +55,7 @@ class HCSR04 {
          * @param fptr function pointer for handling raising and
          * falling interrupts
          */
-        HCSR04 (uint8_t triggerPin, uint8_t echoPin, void (*fptr)(void));
+        HCSR04 (uint8_t triggerPin, uint8_t echoPin, void (*fptr)(void *));
 
         /**
          * HCSR04 object destructor.