diff --git a/lib_com/options.h b/lib_com/options.h
old mode 100755
new mode 100644
index a0c7f4f3f1d68281475c6ac5f56b54abcfdf0d08..225875b2a8e56ba0135b0396aa0933097b8df471
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -132,6 +132,8 @@
 #define NONBE_FIX_947_STEREO_DMX_FADOPT                       /* Orange: Fading optimisation */  
 #endif
 #define FIX_1003_PARAMISM_BINAURAL_RECONFIG_USAN        /* FhG: fix for #1003: fix USAN caused by ParamISM reconfig                    */
+#define FIX_1001_ARI_HM_OVERFLOW                        /* FhG: (no changes needed in BASOP) fix for undef behaviour in in the harmonic TCX model arithmetic coder */
+
 
 /* #################### End BASOP porting switches ############################ */