diff --git a/source/common/utility/i_time.cpp b/source/common/utility/i_time.cpp
index 023860d81..61f7baecb 100644
--- a/source/common/utility/i_time.cpp
+++ b/source/common/utility/i_time.cpp
@@ -185,15 +185,6 @@ double I_GetTimeFrac()
 	return (CurrentFrameStartTime - ticStartTime) / (double)(ticNextTime - ticStartTime);
 }
 
-double I_GetBuildTimeFrac()
-{
-	int currentTic = NSToBuildTic(CurrentFrameStartTime - FirstFrameStartTime);
-	uint64_t ticStartTime = FirstFrameStartTime + BuildTicToNS(currentTic);
-	uint64_t ticNextTime = FirstFrameStartTime + BuildTicToNS(currentTic + 1);
-
-	return (CurrentFrameStartTime - ticStartTime) / (double)(ticNextTime - ticStartTime);
-}
-
 void I_FreezeTime(bool frozen)
 {
 	if (frozen)
diff --git a/source/common/utility/i_time.h b/source/common/utility/i_time.h
index 6f95795dd..4c63515ac 100644
--- a/source/common/utility/i_time.h
+++ b/source/common/utility/i_time.h
@@ -17,7 +17,6 @@ uint64_t I_GetTimeNS();
 int I_GetBuildTime();
 
 double I_GetTimeFrac();
-double I_GetBuildTimeFrac();
 
 // like I_GetTime, except it waits for a new tic before returning
 int I_WaitForTic(int);