diff --git a/ext/alsa/gstalsa.h b/ext/alsa/gstalsa.h
index 8026619d4c..3c3d2d6561 100644
--- a/ext/alsa/gstalsa.h
+++ b/ext/alsa/gstalsa.h
@@ -73,7 +73,7 @@ void      gst_alsa_add_channel_reorder_map (GstObject * obj,
 extern const GstAudioChannelPosition alsa_position[][8];
 #ifdef SND_CHMAP_API_VERSION
 gboolean alsa_chmap_to_channel_positions (const snd_pcm_chmap_t *chmap,
-					  GstAudioChannelPosition *pos);
+                                          GstAudioChannelPosition *pos);
 #endif
 
 #endif /* __GST_ALSA_H__ */