diff --git a/firmware/src/tasks/task.cpp b/firmware/src/tasks/task.cpp
index 7efdff51..ca1bb8ff 100644
--- a/firmware/src/tasks/task.cpp
+++ b/firmware/src/tasks/task.cpp
@@ -57,7 +57,9 @@ inline void Task::checkFps()
                     entry.second);
             }
 
-            DPSerial::sendQueuedDebugLog("Free heap: %i of %i", ESP.getFreeHeap(), ESP.getHeapSize());
+            if(ESP.getHeapSize() != 0){
+                DPSerial::sendQueuedDebugLog("Free heap: %i of %i (%.3f %%)", ESP.getFreeHeap(), ESP.getHeapSize(), 100*ESP.getFreeHeap()/(float)ESP.getHeapSize());
+            }
 
             #ifdef ENABLE_PERFMON
             for(const auto& entry : PerfMon.getResults())