diff --git a/OneWireESP32.cpp b/OneWireESP32.cpp
index 9f033d3..cd26d7a 100644
--- a/OneWireESP32.cpp
+++ b/OneWireESP32.cpp
@@ -21,6 +21,8 @@
 #define OW_SLOT_RECOVERY	5
 #define OW_TIMEOUT	50
 
+static IRAM_ATTR bool owrxdone(rmt_channel_handle_t ch, const rmt_rx_done_event_data_t *edata, void *udata);
+
 
 static rmt_symbol_word_t ow_bit0 = {
 	.duration0 = OW_SLOT_START + OW_SLOT_BIT,
diff --git a/OneWireESP32.h b/OneWireESP32.h
index 91cc46d..445fb59 100644
--- a/OneWireESP32.h
+++ b/OneWireESP32.h
@@ -18,8 +18,6 @@
 #define MAX_BLOCKS	48
 #endif
 
-IRAM_ATTR bool owrxdone(rmt_channel_handle_t ch, const rmt_rx_done_event_data_t *edata, void *udata);
-
 class OneWire32 {
 	private:
 		gpio_num_t owpin;