diff --git a/vocoder/MBEDecoder.h b/vocoder/MBEDecoder.h
index 513a27d..11afae5 100644
--- a/vocoder/MBEDecoder.h
+++ b/vocoder/MBEDecoder.h
@@ -62,9 +62,9 @@ namespace vocoder
     /**
      * @brief Vocoder Decoding Mode
      */
-    enum MBE_DECODER_MODE : int {
-        DECODE_DMR_AMBE = 0,    //! DMR AMBE
-        DECODE_88BIT_IMBE = 1   //! 88-bit IMBE (P25)
+    enum MBE_DECODER_MODE {
+        DECODE_DMR_AMBE,    //! DMR AMBE
+        DECODE_88BIT_IMBE   //! 88-bit IMBE (P25)
     };
 
     // ---------------------------------------------------------------------------
diff --git a/vocoder/MBEEncoder.h b/vocoder/MBEEncoder.h
index 1e7b5cb..0423f5e 100644
--- a/vocoder/MBEEncoder.h
+++ b/vocoder/MBEEncoder.h
@@ -32,9 +32,9 @@ namespace vocoder
     /**
      * @brief Vocoder Encoding Mode
      */
-    enum MBE_ENCODER_MODE : int {
-        ENCODE_DMR_AMBE = 0,    //! DMR AMBE
-        ENCODE_88BIT_IMBE = 1,  //! 88-bit IMBE (P25)
+    enum MBE_ENCODER_MODE {
+        ENCODE_DMR_AMBE,    //! DMR AMBE
+        ENCODE_88BIT_IMBE,  //! 88-bit IMBE (P25)
     };
 
     // ---------------------------------------------------------------------------