diff --git a/include/hardware/audio_alsaops.h b/include/hardware/audio_alsaops.h
index 6a17a35..476c311 100644
--- a/include/hardware/audio_alsaops.h
+++ b/include/hardware/audio_alsaops.h
@@ -60,7 +60,7 @@
     case AUDIO_FORMAT_PCM_FLOAT:  /* there is no equivalent for float */
     default:
         LOG_ALWAYS_FATAL("pcm_format_from_audio_format: invalid audio format %#x", format);
-        return 0;
+        return PCM_FORMAT_INVALID;  /* doesn't get here, assert called above */
     }
 }
 
@@ -94,7 +94,7 @@
 #endif
     default:
         LOG_ALWAYS_FATAL("audio_format_from_pcm_format: invalid pcm format %#x", format);
-        return 0;
+        return AUDIO_FORMAT_INVALID;  /* doesn't get here, assert called above */
     }
 }