diff --git a/apps/renderer.c b/apps/renderer.c
index 1536613953582027d2c0ce08a85a8618eefacc5b..9394fb655efaaa8015ce8648dc3761664a35ceae 100644
--- a/apps/renderer.c
+++ b/apps/renderer.c
@@ -1548,7 +1548,16 @@ int main(
             audioWriter = NULL;
         }
 
+#ifdef FIX_1437_LC3PLUS_EXTREND_HIRES
+        if ( ( error = IVAS_REND_GetSplitRendBitstreamHeader( hIvasRend,
+                                                              &bitsBuffer.config.codec,
+                                                              &bitsBuffer.config.poseCorrection,
+                                                              &bitsBuffer.config.codec_frame_size_ms,
+                                                              &bitsBuffer.config.isar_frame_size_ms,
+                                                              &bitsBuffer.config.lc3plus_highres ) ) != IVAS_ERR_OK )
+#else
         if ( ( error = IVAS_REND_GetSplitRendBitstreamHeader( hIvasRend, &bitsBuffer.config.codec, &bitsBuffer.config.poseCorrection, &bitsBuffer.config.codec_frame_size_ms, &bitsBuffer.config.isar_frame_size_ms ) ) != IVAS_ERR_OK )
+#endif
         {
             fprintf( stderr, "\nError in IVAS_REND_GetSplitRendBitstreamHeader(): %s!\n", ivas_error_to_string( error ) );
             goto cleanup;
diff --git a/lib_com/options.h b/lib_com/options.h
index 10ea208a2d533e39ac724361615e9d5c2ff595a9..84169d48f4029a390729b81aaa36d8065844636e 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -145,6 +145,7 @@
 #define FIX_1419_MONO_STEREO_UMX                        /* FhG: fix for issue 1419 : support upmix to all output formats for mono and stereo */
 #define NONBE_MDCT_ST_DTX_FIX_SUBOPT_SPATIAL_CNG       /* FhG: Fix MDCT-Stereo comfort noise for certain noise types */
 #define NONBE_1344_REND_MASA_LOW_FS                     /* Nokia: Issue 1344: Fix sanitizer errors when using IVAS_rend to render MASA with lower sampling rates */
+#define FIX_1437_LC3PLUS_EXTREND_HIRES                  /* FhG: fix external renderer split bitstream header writing causing a crash for LC3plus High-res mode */
 #define NONBE_1412_AVOID_ROUNDING_AZ_ELEV               /* FhG:  Avoid rounding when passing azimuth and elevation to efap_determine_gains() */
 
 // object-editing feature porting
diff --git a/lib_isar/isar_splitRendererPre.c b/lib_isar/isar_splitRendererPre.c
index c5902b3b5298eed4f62fd15cb25f4c4a4eef75c1..445540715ad5519ac42edd6b55b6cc002207f39a 100644
--- a/lib_isar/isar_splitRendererPre.c
+++ b/lib_isar/isar_splitRendererPre.c
@@ -2876,6 +2876,9 @@ ivas_error splitRendLc3plusEncodeAndWrite(
     pBits->pose_correction = hSplitBin->multiBinPoseData.poseCorrectionMode;
     pBits->codec_frame_size_ms = (Word16) ( hSplitBin->hLc3plusEnc->config.lc3plus_frame_duration_us / 1000 );
     pBits->isar_frame_size_ms = (Word16) ( hSplitBin->hLc3plusEnc->config.isar_frame_duration_us / 1000 );
+#ifdef FIX_1437_LC3PLUS_EXTREND_HIRES
+    pBits->lc3plus_highres = hSplitBin->hLc3plusEnc->config.high_res_mode_enabled;
+#endif
 
     return IVAS_ERR_OK;
 }
diff --git a/lib_rend/lib_rend.h b/lib_rend/lib_rend.h
index f5f1d86cb1b094ec3825b8a4aee70ab36e224987..ea2bc3981e7bbd2c6c2eb7d479d799981be268b4 100644
--- a/lib_rend/lib_rend.h
+++ b/lib_rend/lib_rend.h
@@ -294,7 +294,12 @@ ivas_error IVAS_REND_GetSplitRendBitstreamHeader(
     ISAR_SPLIT_REND_CODEC *pCodec,                  /* o  : pointer to codec setting                            */
     ISAR_SPLIT_REND_POSE_CORRECTION_MODE *poseCorrection,   /* o  : pointer to pose correction mode                     */
     Word16 *pCodec_frame_size_ms,                   /* o  : pointer to codec frame size setting                 */
-    Word16 *pIsar_frame_size_ms                     /* o  : pointer to ISAR frame size setting                  */
+#ifdef FIX_1437_LC3PLUS_EXTREND_HIRES
+    Word16 *pIsar_frame_size_ms,                   /* o  : pointer to ISAR frame size setting                  */
+    Word16 *pLc3plusHighRes                        /* o  : pointer to LC3plus High-Res setting                 */
+#else
+    Word16 *pIsar_frame_size_ms                    /* o  : pointer to ISAR frame size setting                  */
+#endif
 );
 
 ivas_error IVAS_REND_SetHeadRotation(
diff --git a/lib_rend/lib_rend_fx.c b/lib_rend/lib_rend_fx.c
index 299fe9b2ec5ffa6ad84d3e15ee15db337197d864..afd1027d2e1bd948c4f7d05467e8cb1921b5219b 100644
--- a/lib_rend/lib_rend_fx.c
+++ b/lib_rend/lib_rend_fx.c
@@ -9620,7 +9620,12 @@ ivas_error IVAS_REND_GetSplitRendBitstreamHeader(
     ISAR_SPLIT_REND_CODEC *pCodec,                        /* o  : pointer to codec setting              */
     ISAR_SPLIT_REND_POSE_CORRECTION_MODE *poseCorrection, /* o  : pointer to pose correction mode       */
     Word16 *pCodec_frame_size_ms,                         /* o  : pointer to codec frame size setting   */
-    Word16 *pIsar_frame_size_ms                           /* o  : pointer to ISAR frame size setting    */
+#ifdef FIX_1437_LC3PLUS_EXTREND_HIRES
+    Word16 *pIsar_frame_size_ms, /* o  : pointer to ISAR frame size setting      */
+    Word16 *pLc3plusHighRes      /* o  : pointer to LC3plus High-Res setting     */
+#else
+    Word16 *pIsar_frame_size_ms /* o  : pointer to ISAR frame size setting      */
+#endif
 )
 {
     test();
@@ -9633,6 +9638,9 @@ ivas_error IVAS_REND_GetSplitRendBitstreamHeader(
     *pCodec_frame_size_ms = hIvasRend->hRendererConfig->split_rend_config.codec_frame_size_ms;
     *pIsar_frame_size_ms = hIvasRend->hRendererConfig->split_rend_config.isar_frame_size_ms;
     *poseCorrection = hIvasRend->hRendererConfig->split_rend_config.poseCorrectionMode;
+#ifdef FIX_1437_LC3PLUS_EXTREND_HIRES
+    *pLc3plusHighRes = hIvasRend->hRendererConfig->split_rend_config.lc3plus_highres;
+#endif
 
     return IVAS_ERR_OK;
 }