diff --git a/src/menu/joystickmenu.cpp b/src/menu/joystickmenu.cpp
index 676bc1767..90c2b0c4e 100644
--- a/src/menu/joystickmenu.cpp
+++ b/src/menu/joystickmenu.cpp
@@ -225,7 +225,7 @@ public:
 
 	void SetSelection(int Selection)
 	{
-		float f = fabs(SELECTED_JOYSTICK->GetAxisScale(mAxis));
+		float f = fabsf(SELECTED_JOYSTICK->GetAxisScale(mAxis));
 		if (Selection) f*=-1;
 		SELECTED_JOYSTICK->SetAxisScale(mAxis, f);
 	}
diff --git a/src/p_user.cpp b/src/p_user.cpp
index 9f5a37293..0427bd64f 100644
--- a/src/p_user.cpp
+++ b/src/p_user.cpp
@@ -2305,7 +2305,7 @@ void P_PlayerThink (player_t *player)
 	{
 		// A negative scale is used to prevent G_AddViewAngle/G_AddViewPitch
 		// from scaling with the FOV scale.
-		desired *= fabs(player->ReadyWeapon->FOVScale);
+		desired *= fabsf(player->ReadyWeapon->FOVScale);
 	}
 	if (player->FOV != desired)
 	{
diff --git a/src/sound/fmodsound.cpp b/src/sound/fmodsound.cpp
index e7a617f5a..1b9dcfda9 100644
--- a/src/sound/fmodsound.cpp
+++ b/src/sound/fmodsound.cpp
@@ -2311,9 +2311,9 @@ void FMODSoundRenderer::UpdateListener(SoundListener *listener)
 	pos.z = listener->position.Z;
 
 	float angle = listener->angle;
-	forward.x = cos(angle);
+	forward.x = cosf(angle);
 	forward.y = 0;
-	forward.z = sin(angle);
+	forward.z = sinf(angle);
 
 	up.x = 0;
 	up.y = 1;
diff --git a/src/sound/music_win_mididevice.cpp b/src/sound/music_win_mididevice.cpp
index 151728662..38fa18c59 100644
--- a/src/sound/music_win_mididevice.cpp
+++ b/src/sound/music_win_mididevice.cpp
@@ -175,7 +175,7 @@ int WinMIDIDevice::GetTechnology() const
 
 int WinMIDIDevice::SetTempo(int tempo)
 {
-	MIDIPROPTEMPO data = { sizeof(MIDIPROPTEMPO), tempo };
+	MIDIPROPTEMPO data = { sizeof(MIDIPROPTEMPO), (DWORD)tempo };
 	return midiStreamProperty(MidiOut, (LPBYTE)&data, MIDIPROP_SET | MIDIPROP_TEMPO);
 }
 
@@ -187,7 +187,7 @@ int WinMIDIDevice::SetTempo(int tempo)
 
 int WinMIDIDevice::SetTimeDiv(int timediv)
 {
-	MIDIPROPTIMEDIV data = { sizeof(MIDIPROPTIMEDIV), timediv };
+	MIDIPROPTIMEDIV data = { sizeof(MIDIPROPTIMEDIV), (DWORD)timediv };
 	return midiStreamProperty(MidiOut, (LPBYTE)&data, MIDIPROP_SET | MIDIPROP_TIMEDIV);
 }
 
diff --git a/src/tflags.h b/src/tflags.h
index 48866c828..81e54e3bb 100644
--- a/src/tflags.h
+++ b/src/tflags.h
@@ -42,7 +42,7 @@
  * T is the enum type of individual flags,
  * TT is the underlying integer type used (defaults to DWORD)
  */
-template<typename T, typename TT = DWORD>
+template<typename T, typename TT = uint32>
 class TFlags
 {
 	struct ZeroDummy {};
diff --git a/src/timidity/mix.cpp b/src/timidity/mix.cpp
index beda91e16..05a3eddd4 100644
--- a/src/timidity/mix.cpp
+++ b/src/timidity/mix.cpp
@@ -190,7 +190,7 @@ void SF2Envelope::Release(Voice *v)
 	if (stage == SF2_ATTACK)
 	{
 		// The attack stage does not use an attenuation in cB like all the rest.
-		volume = log10(volume) * -200;
+		volume = float(log10(volume) * -200);
 	}
 	stage = SF2_RELEASE;
 	bUpdating = true;
diff --git a/src/timidity/playmidi.cpp b/src/timidity/playmidi.cpp
index 7d8294384..8acdd3487 100644
--- a/src/timidity/playmidi.cpp
+++ b/src/timidity/playmidi.cpp
@@ -94,7 +94,7 @@ void Renderer::recompute_freq(int v)
 		if (ch->pitchfactor == 0)
 		{
 			/* Damn. Somebody bent the pitch. */
-			ch->pitchfactor = pow(2.f, ((abs(pb) * ch->pitchsens) / (8191.f * 1200.f)));
+			ch->pitchfactor = float(pow(2.f, ((abs(pb) * ch->pitchsens) / (8191.f * 1200.f))));
 		}
 		if (pb < 0)
 		{
diff --git a/src/win32/fb_d3d9.cpp b/src/win32/fb_d3d9.cpp
index 4e3a14c18..d0ed84442 100644
--- a/src/win32/fb_d3d9.cpp
+++ b/src/win32/fb_d3d9.cpp
@@ -1487,10 +1487,10 @@ void D3DFB::DoOffByOneCheck ()
 	float texbot = 1.f / float(FBHeight);
 	FBVERTEX verts[4] =
 	{
-		{ -0.5f,  -0.5f, 0.5f, 1.f, 0, ~0,      0.f,    0.f },
-		{ 255.5f, -0.5f, 0.5f, 1.f, 0, ~0, texright,    0.f },
-		{ 255.5f,  0.5f, 0.5f, 1.f, 0, ~0, texright, texbot },
-		{ -0.5f,   0.5f, 0.5f, 1.f, 0, ~0,      0.f, texbot }
+		{ -0.5f,  -0.5f, 0.5f, 1.f, D3DCOLOR_RGBA(0,0,0,0), D3DCOLOR_RGBA(255,255,255,255),      0.f,    0.f },
+		{ 255.5f, -0.5f, 0.5f, 1.f, D3DCOLOR_RGBA(0,0,0,0), D3DCOLOR_RGBA(255,255,255,255), texright,    0.f },
+		{ 255.5f,  0.5f, 0.5f, 1.f, D3DCOLOR_RGBA(0,0,0,0), D3DCOLOR_RGBA(255,255,255,255), texright, texbot },
+		{ -0.5f,   0.5f, 0.5f, 1.f, D3DCOLOR_RGBA(0,0,0,0), D3DCOLOR_RGBA(255,255,255,255),      0.f, texbot }
 	};
 	int i, c;
 
diff --git a/src/win32/i_system.cpp b/src/win32/i_system.cpp
index 133337af5..a5c2eb84e 100644
--- a/src/win32/i_system.cpp
+++ b/src/win32/i_system.cpp
@@ -1423,11 +1423,11 @@ static HCURSOR CreateBitmapCursor(int xhot, int yhot, HBITMAP and_mask, HBITMAP
 {
 	ICONINFO iconinfo =
 	{
-		FALSE,		// fIcon
-		xhot,		// xHotspot
-		yhot,		// yHotspot
-		and_mask,	// hbmMask
-		color_mask	// hbmColor
+		FALSE,			// fIcon
+		(DWORD)xhot,	// xHotspot
+		(DWORD)yhot,	// yHotspot
+		and_mask,		// hbmMask
+		color_mask		// hbmColor
 	};
 	HCURSOR cursor = CreateIconIndirect(&iconinfo);