diff --git a/src/drivers/rpm/pcf8583/PCF8583.cpp b/src/drivers/rpm/pcf8583/PCF8583.cpp
index fcc9828dad..085015247f 100644
--- a/src/drivers/rpm/pcf8583/PCF8583.cpp
+++ b/src/drivers/rpm/pcf8583/PCF8583.cpp
@@ -195,8 +195,8 @@ void PCF8583::RunImpl()
 	}
 
 	// Calculate RPM and accuracy estimation
-	float indicated_rpm = (((float)diffCount / _param_pcf8583_magnet.get()) / ((float)diffTime / 1000000.f)) * 60.f;
-	float estimated_accurancy = 1 / (float)_param_pcf8583_magnet.get() / ((float)diffTime / 1000000) * 60.f;
+	float indicated_rpm = (((float)diffCount / _param_pcf8583_magnet.get()) / ((float)diffTime / 1e6f)) * 60.f;
+	float estimated_accurancy = 1 / (float)_param_pcf8583_magnet.get() / ((float)diffTime / 1e6f) * 60.f;
 
 	// publish data to uorb
 	rpm_s msg{};