diff --git a/pid/fancontroller.cpp b/pid/fancontroller.cpp
index 44852a0..ddfea20 100644
--- a/pid/fancontroller.cpp
+++ b/pid/fancontroller.cpp
@@ -175,7 +175,7 @@
     {
         auto sensor = _owner->getSensor(it);
         auto redundantWrite = _owner->getRedundantWrite();
-        int64_t rawWritten;
+        int64_t rawWritten = -1;
         sensor->write(percent, redundantWrite, &rawWritten);
 
         // The outputCache will be used later,