diff --git a/src/posix/cocoa/i_timer.cpp b/src/posix/cocoa/i_timer.cpp
index b08a43139d..901657eb95 100644
--- a/src/posix/cocoa/i_timer.cpp
+++ b/src/posix/cocoa/i_timer.cpp
@@ -186,7 +186,7 @@ unsigned int I_FPSTime()
 }
 
 
-fixed_t I_GetTimeFrac(uint32* ms)
+double I_GetTimeFrac(uint32* ms)
 {
 	const uint32_t now = I_MSTime();
 
@@ -196,8 +196,8 @@ fixed_t I_GetTimeFrac(uint32* ms)
 	}
 
 	return 0 == s_ticStart
-		? FRACUNIT
-		: clamp<fixed_t>( (now - s_ticStart) * FRACUNIT * TICRATE / 1000, 0, FRACUNIT);
+		? 1.
+		: clamp<double>( (now - s_ticStart) * TICRATE / 1000., 0, 1);
 }
 
 
diff --git a/src/posix/i_system.h b/src/posix/i_system.h
index 3915036028..0515f2d857 100644
--- a/src/posix/i_system.h
+++ b/src/posix/i_system.h
@@ -62,7 +62,7 @@ extern int (*I_WaitForTic) (int);
 // tic will never arrive (unless it's the current one).
 extern void (*I_FreezeTime) (bool frozen);
 
-fixed_t I_GetTimeFrac (uint32 *ms);
+double I_GetTimeFrac (uint32 *ms);
 
 // Return a seed value for the RNG.
 unsigned int I_MakeRNGSeed();
diff --git a/src/posix/sdl/i_timer.cpp b/src/posix/sdl/i_timer.cpp
index 6255c8a96c..fa08659a10 100644
--- a/src/posix/sdl/i_timer.cpp
+++ b/src/posix/sdl/i_timer.cpp
@@ -178,7 +178,7 @@ void I_SelectTimer()
 }
 
 // Returns the fractional amount of a tic passed since the most recent tic
-fixed_t I_GetTimeFrac (uint32 *ms)
+double I_GetTimeFrac (uint32 *ms)
 {
 	DWORD now = SDL_GetTicks ();
 	if (ms) *ms = TicStart + (1000 / TICRATE);
@@ -188,8 +188,7 @@ fixed_t I_GetTimeFrac (uint32 *ms)
 	}
 	else
 	{
-		fixed_t frac = clamp<fixed_t> ((now - TicStart)*FRACUNIT*TICRATE/1000, 0, FRACUNIT);
-		return frac;
+		return clamp<double>((now - TicStart) * TICRATE / 1000., 0, 1);
 	}
 }
 
diff --git a/src/r_utility.cpp b/src/r_utility.cpp
index c3229c14cc..224648770b 100644
--- a/src/r_utility.cpp
+++ b/src/r_utility.cpp
@@ -1006,12 +1006,12 @@ void R_SetupFrame (AActor *actor)
 		iview->otic = nowtic;
 	}
 
-	r_TicFrac = I_GetTimeFrac (&r_FrameTime);
+	r_TicFracF = I_GetTimeFrac (&r_FrameTime);
 	if (cl_capfps || r_NoInterpolate)
 	{
-		r_TicFrac = FRACUNIT;
+		r_TicFracF = 1.;
 	}
-	r_TicFracF = FIXED2DBL(r_TicFrac);
+	r_TicFrac = FLOAT2FIXED(r_TicFracF);
 
 	R_InterpolateView (player, r_TicFrac, iview);
 
diff --git a/src/win32/i_system.cpp b/src/win32/i_system.cpp
index 0db4dd15e5..ebf90e476d 100644
--- a/src/win32/i_system.cpp
+++ b/src/win32/i_system.cpp
@@ -468,7 +468,7 @@ static void CALLBACK TimerTicked(UINT id, UINT msg, DWORD_PTR user, DWORD_PTR dw
 //
 //==========================================================================
 
-fixed_t I_GetTimeFrac(uint32 *ms)
+double I_GetTimeFrac(uint32 *ms)
 {
 	DWORD now = timeGetTime();
 	if (ms != NULL)
@@ -478,12 +478,11 @@ fixed_t I_GetTimeFrac(uint32 *ms)
 	DWORD step = TicNext - TicStart;
 	if (step == 0)
 	{
-		return FRACUNIT;
+		return 1.;
 	}
 	else
 	{
-		fixed_t frac = clamp<fixed_t> ((now - TicStart)*FRACUNIT/step, 0, FRACUNIT);
-		return frac;
+		return clamp<double>(double(now - TicStart) / step, 0, 1);
 	}
 }
 
diff --git a/src/win32/i_system.h b/src/win32/i_system.h
index 179af48046..8e75b22a3f 100644
--- a/src/win32/i_system.h
+++ b/src/win32/i_system.h
@@ -90,7 +90,7 @@ extern int (*I_WaitForTic) (int);
 // tic will never arrive (unless it's the current one).
 extern void (*I_FreezeTime) (bool frozen);
 
-fixed_t I_GetTimeFrac (uint32 *ms);
+double I_GetTimeFrac (uint32 *ms);
 
 // Return a seed value for the RNG.
 unsigned int I_MakeRNGSeed();