diff --git a/sound/pci/ymfpci/ymfpci_main.c b/sound/pci/ymfpci/ymfpci_main.c
index a1aa74b79b3..30ee53adb49 100644
--- a/sound/pci/ymfpci/ymfpci_main.c
+++ b/sound/pci/ymfpci/ymfpci_main.c
@@ -536,13 +536,17 @@ static void snd_ymfpci_pcm_init_voice(struct snd_ymfpci_pcm *ypcm, unsigned int
 			}
 		}
 		if (ypcm->output_rear) {
+			/* The SPDIF out channels seem to be swapped, so we have
+			 * to swap them here, too.  The rear analog out channels
+			 * will be wrong, but otherwise AC3 would not work.
+			 */
 			if (use_left) {
-				bank->eff2_gain =
-				bank->eff2_gain_end = vol_left;
+				bank->eff3_gain =
+				bank->eff3_gain_end = vol_left;
 			}
 			if (use_right) {
-				bank->eff3_gain =
-				bank->eff3_gain_end = vol_right;
+				bank->eff2_gain =
+				bank->eff2_gain_end = vol_right;
 			}
 		}
 	}