diff --git a/cores/arduino/Tone.cpp b/cores/arduino/Tone.cpp
index 1bfb3e379..2ad0fc4b9 100644
--- a/cores/arduino/Tone.cpp
+++ b/cores/arduino/Tone.cpp
@@ -349,7 +349,7 @@ void tone(uint8_t _pin, unsigned int frequency, unsigned long duration)
// Calculate the toggle count
if (duration > 0)
{
- toggle_count = 2 * frequency * duration / 1000;
+ toggle_count = 2 * (unsigned long)frequency * duration / 1000;
}
else
{
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