diff --git a/lib_com/options.h b/lib_com/options.h
index 8a9848e4d2ef7f1b1e25934c1916a76c8bc1e117..432ef5045ab52a3520090b3bee4c74f5fad8bc97 100755
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -87,6 +87,8 @@
 #define FIX_1824
 #define FIX_1822
 
+#define FIX_1844_MISSING_FREE                                /* FhG: add missing free in ivas_binRenderer_convModuleClose_fx() */
+
 /* #################### Start BASOP porting switches ############################ */
 
 #define FIX_1372_ISAR_POST_REND
diff --git a/lib_dec/ivas_binRenderer_internal_fx.c b/lib_dec/ivas_binRenderer_internal_fx.c
index f3652b563346eb64ed759a8137c7132a3ec0ac3a..84102f51abe96a174aeb0e866225b4bf69285784 100644
--- a/lib_dec/ivas_binRenderer_internal_fx.c
+++ b/lib_dec/ivas_binRenderer_internal_fx.c
@@ -1568,6 +1568,10 @@ static void ivas_binRenderer_convModuleClose_fx(
     free( hBinRenConvModule->filterStatesLeftImag_fx );
     hBinRenConvModule->filterStatesLeftImag_fx = NULL;
 
+#ifdef FIX_1844_MISSING_FREE
+    free( hBinRenConvModule->Q_filterStates );
+    hBinRenConvModule->Q_filterStates = NULL;
+#endif
 
     free( ( *hBinRenderer )->hBinRenConvModule );
     ( *hBinRenderer )->hBinRenConvModule = NULL;