diff --git a/examples/31-rsm/reflectiveshadowmap.cpp b/examples/31-rsm/reflectiveshadowmap.cpp
index 07856d13d..e18ce02bb 100644
--- a/examples/31-rsm/reflectiveshadowmap.cpp
+++ b/examples/31-rsm/reflectiveshadowmap.cpp
@@ -668,10 +668,10 @@ public:
 	void updateLightDir()
 	{
 		float el = m_lightElevation * (bx::pi/180.0f);
-		float az = m_lightAzimuth * (bx::pi/180.0f);
-		m_lightDir[0] = cos(el)*cos(az);
-		m_lightDir[2] = cos(el)*sin(az);
-		m_lightDir[1] = sin(el);
+		float az = m_lightAzimuth   * (bx::pi/180.0f);
+		m_lightDir[0] = bx::fcos(el)*bx::fcos(az);
+		m_lightDir[2] = bx::fcos(el)*bx::fsin(az);
+		m_lightDir[1] = bx::fsin(el);
 		m_lightDir[3] = 0.0f;
 	}