Index: trunk/src/sdl/sdl_audio.cc
===================================================================
--- trunk/src/sdl/sdl_audio.cc	(revision 440)
+++ trunk/src/sdl/sdl_audio.cc	(revision 453)
@@ -75,5 +75,5 @@
 			if ( relative != vec3() )
 			{
-				angle = glm::degrees( -glm::orientedAngle( m_forward, glm::normalize( relative ), m_up ) );
+				angle = math::degrees( -glm::orientedAngle( m_forward, glm::normalize( relative ), m_up ) );
 				distance = glm::clamp( 20.0f * glm::length( relative ), 0.0f, 255.0f );
 			}