diff --git a/source/maths/MathUtil.h b/source/maths/MathUtil.h
index 015f04dc72..d8d981c6c7 100644
--- a/source/maths/MathUtil.h
+++ b/source/maths/MathUtil.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 2021 Wildfire Games.
+/* Copyright (C) 2022 Wildfire Games.
  * This file is part of 0 A.D.
  *
  * 0 A.D. is free software: you can redistribute it and/or modify
@@ -45,13 +45,14 @@ inline T SmoothStep(T edge0, T edge1, T value)
 	return value * value * (3 - 2 * value);
 }
 
-inline float sgn(float a)
+template<typename T>
+inline T Sign(const T value)
 {
-    if (a > 0.0f)
-    	return 1.0f;
-    if (a < 0.0f)
-    	return -1.0f;
-    return 0.0f;
+    if (value > T(0))
+    	return T(1);
+    if (value < T(0))
+    	return T(-1);
+    return T(0);
 }
 
 #endif // INCLUDED_MATHUTIL
diff --git a/source/renderer/SceneRenderer.cpp b/source/renderer/SceneRenderer.cpp
index e35e3805b1..82a2634e46 100644
--- a/source/renderer/SceneRenderer.cpp
+++ b/source/renderer/SceneRenderer.cpp
@@ -501,10 +501,10 @@ void CSceneRenderer::SetObliqueFrustumClipping(CCamera& camera, const CVector4D&
 	// by the inverse of the projection matrix
 
 	CVector4D q;
-	q.X = (sgn(camPlane.X) - matrix[8]/matrix[11]) / matrix[0];
-	q.Y = (sgn(camPlane.Y) - matrix[9]/matrix[11]) / matrix[5];
-	q.Z = 1.0f/matrix[11];
-	q.W = (1.0f - matrix[10]/matrix[11]) / matrix[14];
+	q.X = (Sign(camPlane.X) - matrix[8] / matrix[11]) / matrix[0];
+	q.Y = (Sign(camPlane.Y) - matrix[9] / matrix[11]) / matrix[5];
+	q.Z = 1.0f / matrix[11];
+	q.W = (1.0f - matrix[10] / matrix[11]) / matrix[14];
 
 	// Calculate the scaled plane vector
 	CVector4D c = camPlane * (2.0f * matrix[11] / camPlane.Dot(q));