diff -Nurb --strip-trailing-cr audacious-plugins-3.7-beta1-orig/src/adplug/core/s3m.cc audacious-plugins-3.7-beta1/src/adplug/core/s3m.cc
--- audacious-plugins-3.7-beta1-orig/src/adplug/core/s3m.cc	2015-10-02 04:33:32.000000000 +0200
+++ audacious-plugins-3.7-beta1/src/adplug/core/s3m.cc	2015-10-04 14:48:14.945625605 +0200
@@ -25,7 +25,7 @@
 #include <cstring>
 #include "s3m.h"
 
-const char Cs3mPlayer::chnresolv[] =    // S3M -> adlib channel conversion
+const signed char Cs3mPlayer::chnresolv[] =    // S3M -> adlib channel conversion
   {-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,0,1,2,3,4,5,6,7,8,-1,-1,-1,-1,-1,-1,-1};
 
 const unsigned short Cs3mPlayer::notetable[12] =                // S3M adlib note table
diff -Nurb --strip-trailing-cr audacious-plugins-3.7-beta1-orig/src/adplug/core/s3m.h audacious-plugins-3.7-beta1/src/adplug/core/s3m.h
--- audacious-plugins-3.7-beta1-orig/src/adplug/core/s3m.h	2015-10-02 04:33:32.000000000 +0200
+++ audacious-plugins-3.7-beta1/src/adplug/core/s3m.h	2015-10-04 14:48:14.224664422 +0200
@@ -90,7 +90,7 @@
   unsigned char crow,ord,speed,tempo,del,songend,loopstart,loopcnt;
 
  private:
-  static const char chnresolv[];
+  static const signed char chnresolv[];
   static const unsigned short notetable[12];
   static const unsigned char vibratotab[32];