diff --git a/lib_com/options.h b/lib_com/options.h
old mode 100644
new mode 100755
index a11a26b154739746f8d9e444eabbec42c249037c..11c13cd4a4603669c2416532b0c52f7e88ccfa24
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -189,6 +189,7 @@
 #define FIX_622_SILENCE_USAN_WARNING                    /* FhG: silenceusan warning in ifft code */
 
 #define FIX_615_UBSAN_SPAR_TO_DIRAC                     /*Dlb : Fix for UBSAN issue 615*/
+#define FIX_626_VARIABLE_TYPE_MDCT_CONC                 /* FhG: trivial fix to fix USAN error */
 #define FIX_616_DIV_ZERO_MCT                            /*FhG : Fix UBSAN division by zero error of issue 616*/
 
 /* ################## End BE DEVELOPMENT switches ######################### */
diff --git a/lib_dec/tonalMDCTconcealment.c b/lib_dec/tonalMDCTconcealment.c
index 86340ab181f6abf6af3116cb377064c773865a63..e4d033d7fb86f9b3f9f153ebf7f49cd2633115e9 100644
--- a/lib_dec/tonalMDCTconcealment.c
+++ b/lib_dec/tonalMDCTconcealment.c
@@ -126,7 +126,11 @@ void TonalMDCTConceal_SaveFreqSignal(
     const int16_t infoIGFStartLine )
 {
     float *temp;
+#ifdef FIX_626_VARIABLE_TYPE_MDCT_CONC
+    uint16_t nOldSamples;
+#else
     int16_t nOldSamples;
+#endif
 
     assert( nNewSamples > 0 && nNewSamples <= 2 * L_FRAME_MAX );