diff --git a/libraries/AP_LeakDetector/AP_LeakDetector_Analog.cpp b/libraries/AP_LeakDetector/AP_LeakDetector_Analog.cpp
index 558b3bc3ef..4ee0ced294 100644
--- a/libraries/AP_LeakDetector/AP_LeakDetector_Analog.cpp
+++ b/libraries/AP_LeakDetector/AP_LeakDetector_Analog.cpp
@@ -11,8 +11,7 @@ AP_LeakDetector_Analog::AP_LeakDetector_Analog(AP_LeakDetector &_leak_detector,
 
 void AP_LeakDetector_Analog::read()
 {
-    if (source != NULL && leak_detector._pin[state.instance] >= 0) {
-        source->set_pin(leak_detector._pin[state.instance]);
+    if (source != NULL && leak_detector._pin[state.instance] >= 0 && source->set_pin(leak_detector._pin[state.instance])) {
         state.status = source->voltage_average() > 2.0f;
         state.status = state.status != leak_detector._default_reading[state.instance];
     } else {