diff --git a/sp/src/game/shared/SoundEmitterSystem.cpp b/sp/src/game/shared/SoundEmitterSystem.cpp
index 6b10c6fead..131639bd84 100644
--- a/sp/src/game/shared/SoundEmitterSystem.cpp
+++ b/sp/src/game/shared/SoundEmitterSystem.cpp
@@ -1001,7 +1001,11 @@ class CSoundEmitterSystem : public CBaseGameSystem
 
 			if ( duration )
 			{
-				*duration = enginesound->GetSoundDuration( pSample );
+				if ( Q_stristr( pSample, ".mp3" ) ) {
+					*duration = 0;
+				} else {
+					*duration = enginesound->GetSoundDuration( pSample );
+				}
 			}
 
 			TraceEmitSound( "EmitAmbientSound:  Raw wave emitted '%s' (ent %i)\n",