diff --git a/source/common/utility/i_time.cpp b/source/common/utility/i_time.cpp
index d0cbaf8f1..4f2ac96cb 100644
--- a/source/common/utility/i_time.cpp
+++ b/source/common/utility/i_time.cpp
@@ -198,12 +198,12 @@ void I_ResetFrameTime()
 	FirstFrameStartTime += (CurrentFrameStartTime - ft);
 }
 
-double I_GetInputFrac(bool const synchronised, double const ticrate)
+double I_GetInputFrac(bool const synchronised)
 {
 	if (!synchronised)
 	{
 		const double now = I_msTimeF();
-		const double result = (now - lastinputtime) * ticrate * (1. / 1000.);
+		const double result = (now - lastinputtime) * GameTicRate * (1. / 1000.);
 		lastinputtime = now;
 
 		if (result < 1)
@@ -213,7 +213,7 @@ double I_GetInputFrac(bool const synchronised, double const ticrate)
 			// This rectifies a deviation of 100+ ms or more depending on the length
 			// of the operation to be within 1-2 ms of synchronised input
 			// from 60 fps to at least 1000 fps at ticrates of 30 and 40 Hz.
-			return result * (1. + 0.35 * (1. - ticrate * (1. / 50.)) * (1. - result));
+			return result * (1. + 0.35 * (1. - GameTicRate * (1. / 50.)) * (1. - result));
 		}
 	}
 
diff --git a/source/common/utility/i_time.h b/source/common/utility/i_time.h
index 4e7874bb8..d9501ea96 100644
--- a/source/common/utility/i_time.h
+++ b/source/common/utility/i_time.h
@@ -40,7 +40,7 @@ uint64_t I_nsTime();
 void I_ResetFrameTime();
 
 // Return a decimal fraction to scale input operations at framerate
-double I_GetInputFrac(bool const synchronised, double const ticrate = GameTicRate);
+double I_GetInputFrac(bool const synchronised);
 
 // Reset the last input check to after a lengthy operation
 void I_ResetInputTime();