diff --git a/lib_com/options.h b/lib_com/options.h
old mode 100755
new mode 100644
index 8a5f0f8b5283c6823111071f07b47a85d4c116b1..f4ea46fb846ffd0cc48057534e23324b3408cf1e
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -157,6 +157,7 @@
 #define FIX_891_PARAMUPMIX_CLEANUP                      /* Dlb: issue 891: remove unneeded code from ParamUpmix */
 #define FIX_917_LCLD_WARNINGS                           /* Dlb: issue 917 and 918: fix LCLD codec warnings*/
 #define FIX_920_IGF_INIT_ERROR                          /* FhG: issue 920: fix bitrate mismatch in initial IGF config to avoid error message in same cases */
+#define FIX_923_EXTERNAL_REND_COMMAND_LINE              /* VA: issue 923: enable external renderer command-line options in UPPER case letters */
 
 /* #################### End BE switches ################################## */
 
diff --git a/lib_util/cmdln_parser.c b/lib_util/cmdln_parser.c
index 6ac2b0ec2d0ebf5e58c7637c5c00e3e813dd4444..82119948655590e12e603faf8bd3fe6d4feae00e 100644
--- a/lib_util/cmdln_parser.c
+++ b/lib_util/cmdln_parser.c
@@ -150,7 +150,26 @@ static int8_t optionMatchesString(
 
     const char *optionName = stringToOptionName( str );
 
+#ifdef FIX_923_EXTERNAL_REND_COMMAND_LINE
+    char optionName_to_upper[FILENAME_MAX];
+    strncpy( optionName_to_upper, optionName, sizeof( optionName_to_upper ) - 1 );
+    optionName_to_upper[sizeof( optionName_to_upper ) - 1] = '\0';
+    to_upper( optionName_to_upper );
+
+    char match_to_upper[FILENAME_MAX];
+    strncpy( match_to_upper, opt.props.match, sizeof( match_to_upper ) - 1 );
+    optionName_to_upper[sizeof( match_to_upper ) - 1] = '\0';
+    to_upper( match_to_upper );
+
+    char matchShort_to_upper[FILENAME_MAX];
+    strncpy( matchShort_to_upper, opt.props.matchShort, sizeof( matchShort_to_upper ) - 1 );
+    optionName_to_upper[sizeof( matchShort_to_upper ) - 1] = '\0';
+    to_upper( matchShort_to_upper );
+
+    if ( strncmp( optionName_to_upper, match_to_upper, MAX_OPTION_LENGTH ) == 0 || strncmp( optionName_to_upper, matchShort_to_upper, MAX_OPTION_LENGTH ) == 0 )
+#else
     if ( strncmp( optionName, opt.props.match, MAX_OPTION_LENGTH ) == 0 || strncmp( optionName, opt.props.matchShort, MAX_OPTION_LENGTH ) == 0 )
+#endif
     {
         return 1;
     }