diff --git a/api/HardwareI2C.h b/api/HardwareI2C.h
index c107d1a6..4a8e5f98 100644
--- a/api/HardwareI2C.h
+++ b/api/HardwareI2C.h
@@ -36,8 +36,8 @@ class HardwareI2C : public Stream
virtual uint8_t endTransmission(bool stopBit) = 0;
virtual uint8_t endTransmission(void) = 0;
- virtual uint8_t requestFrom(uint8_t address, size_t len, bool stopBit) = 0;
- virtual uint8_t requestFrom(uint8_t address, size_t len) = 0;
+ virtual size_t requestFrom(uint8_t address, size_t len, bool stopBit) = 0;
+ virtual size_t requestFrom(uint8_t address, size_t len) = 0;
virtual void onReceive(void(*)(int)) = 0;
virtual void onRequest(void(*)(void)) = 0;
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