diff --git a/lib_com/options.h b/lib_com/options.h
index 798096b9e53a08ca1796d5cea739b0d40ee64ffc..fb44bc52b9ad9982914cca3d4c73bc49af4558ff 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -198,8 +198,8 @@
 #define SPLIT_REND_POSE_CORRECTION_UNUSED_BITS
 #define ISAR_BITSTREAM_UPDATE_LC3PLUS                   /* FhG: Multiple improvements to the ISAR bitstream when LC3plus is used. See MR 1456 for details. */
 #endif
-
-#define NONBE_FIX_855_JBM_FLUSH_OFFSET                        /* FhG: issue #855: add missing switch here for the code in JBM flushing  */
+#define NONBE_FIX_855_JBM_FLUSH_OFFSET                  /* FhG: issue #855: add missing switch here for the code in JBM flushing  */
+#define FIX_923_EXTERNAL_REND_COMMAND_LINE              /* VA: issue 923: enable external renderer command-line options in UPPER case letters */
 
 /* #################### End BASOP porting switches ############################ */
 
diff --git a/lib_util/cmdln_parser.c b/lib_util/cmdln_parser.c
index b2c8f85bc4dc7119e7268271f44fcce2af9c703c..432db36a52900a161c87c63ede257de1c78501a8 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;
     }