diff --git a/source/core/gameinput.h b/source/core/gameinput.h
index 241591b91..fa6ff6390 100644
--- a/source/core/gameinput.h
+++ b/source/core/gameinput.h
@@ -272,4 +272,4 @@ FSerializer& Serialize(FSerializer& arc, const char* keyname, PlayerHorizon& w,
 void processMovement(InputPacket* currInput, InputPacket* inputBuffer, ControlInfo* const hidInput, double const scaleAdjust, int const drink_amt = 0, bool const allowstrafe = true, double const turnscale = 1);
 void sethorizon(fixedhoriz* horiz, float const horz, ESyncBits* actions, double const scaleAdjust = 1);
 void applylook(PlayerAngle* angle, float const avel, ESyncBits* actions, double const scaleAdjust = 1);
-void calcviewpitch(vec2_t const pos, fixedhoriz* horizoff, binangle const ang, bool const aimmode, bool const canslopetilt, int const cursectnum, double const scaleAdjust, bool const climbing = false);
+void calcviewpitch(vec2_t const pos, fixedhoriz* horizoff, binangle const ang, bool const aimmode, bool const canslopetilt, int const cursectnum, double const scaleAdjust = 1, bool const climbing = false);
diff --git a/source/games/duke/src/inlines.h b/source/games/duke/src/inlines.h
index 1cc44ebdf..abdf69b7c 100644
--- a/source/games/duke/src/inlines.h
+++ b/source/games/duke/src/inlines.h
@@ -193,7 +193,7 @@ inline double get16thOfHoriz(int const snum, bool const interpolate, double cons
 	return (!interpolate ? ps[snum].horizon.sum() : ps[snum].horizon.interpolatedsum(smoothratio)).asq16() * (0.0625 / FRACUNIT);
 }
 
-inline void doslopetilting(player_struct* p, double const scaleAdjust)
+inline void doslopetilting(player_struct* p, double const scaleAdjust = 1)
 {
 	bool const canslopetilt = p->on_ground && sector[p->cursectnum].lotag != ST_2_UNDERWATER && (sector[p->cursectnum].floorstat & 2);
 	calcviewpitch(p->pos.vec2, &p->horizon.horizoff, p->angle.ang, p->aim_mode == 0, canslopetilt, p->cursectnum, scaleAdjust);
diff --git a/source/games/duke/src/player_d.cpp b/source/games/duke/src/player_d.cpp
index b93d62ac0..9ba455aae 100644
--- a/source/games/duke/src/player_d.cpp
+++ b/source/games/duke/src/player_d.cpp
@@ -2779,7 +2779,7 @@ void processinput_d(int snum)
 	if (SyncInput())
 	{
 		p->horizon.backup();
-		doslopetilting(p, 1);
+		doslopetilting(p);
 	}
 
 	if (chz.type == kHitSprite)
diff --git a/source/games/duke/src/player_r.cpp b/source/games/duke/src/player_r.cpp
index 7afa1be35..2e55f3ab7 100644
--- a/source/games/duke/src/player_r.cpp
+++ b/source/games/duke/src/player_r.cpp
@@ -3461,7 +3461,7 @@ void processinput_r(int snum)
 	if (SyncInput())
 	{
 		p->horizon.backup();
-		doslopetilting(p, 1);
+		doslopetilting(p);
 	}
 
 	if (chz.type == kHitSprite)