diff --git a/channels/smartcard/client/smartcard_operations.c b/channels/smartcard/client/smartcard_operations.c
index da86ff865..65f854120 100644
--- a/channels/smartcard/client/smartcard_operations.c
+++ b/channels/smartcard/client/smartcard_operations.c
@@ -421,7 +421,7 @@ static LONG smartcard_ListReaderGroupsW_Call(SMARTCARD_DEVICE* smartcard,
 	status = ret.ReturnCode =
 	    SCardListReaderGroupsW(operation->hContext, (LPWSTR)&mszGroups, &cchGroups);
 	ret.msz = (BYTE*)mszGroups;
-	ret.cBytes = cchGroups;
+	ret.cBytes = cchGroups * sizeof(WCHAR);
 
 	if (status != SCARD_S_SUCCESS)
 		return status;
@@ -1719,6 +1719,9 @@ static LONG smartcard_StatusW_Call(SMARTCARD_DEVICE* smartcard, SMARTCARD_OPERAT
 		ret.cbAtrLen = cbAtrLen;
 	}
 
+	/* SCardStatusW returns number of characters, we need number of bytes */
+	ret.cBytes *= sizeof(WCHAR);
+
 	status = smartcard_pack_status_return(smartcard, irp->output, &ret, TRUE);
 	if (status != SCARD_S_SUCCESS)
 		return status;
diff --git a/channels/smartcard/client/smartcard_pack.c b/channels/smartcard/client/smartcard_pack.c
index fd88355f6..23a10cc45 100644
--- a/channels/smartcard/client/smartcard_pack.c
+++ b/channels/smartcard/client/smartcard_pack.c
@@ -2043,8 +2043,6 @@ LONG smartcard_pack_list_reader_groups_return(SMARTCARD_DEVICE* smartcard, wStre
                                               const ListReaderGroups_Return* ret, BOOL unicode)
 {
 	DWORD index = 0;
-	UINT32 size = unicode ? sizeof(WCHAR) : sizeof(CHAR);
-	size *= ret->cBytes;
 
 	smartcard_trace_list_reader_groups_return(smartcard, ret, unicode);
 	if (ret->ReturnCode != SCARD_S_SUCCESS)
@@ -2053,11 +2051,11 @@ LONG smartcard_pack_list_reader_groups_return(SMARTCARD_DEVICE* smartcard, wStre
 	if (!Stream_EnsureRemainingCapacity(s, 4))
 		return SCARD_E_NO_MEMORY;
 
-	Stream_Write_UINT32(s, size); /* cBytes (4 bytes) */
-	if (!smartcard_ndr_pointer_write(s, &index, size))
+	Stream_Write_UINT32(s, ret->cBytes); /* cBytes (4 bytes) */
+	if (!smartcard_ndr_pointer_write(s, &index, ret->cBytes))
 		return SCARD_E_NO_MEMORY;
 
-	return smartcard_ndr_write(s, ret->msz, size, 1, NDR_PTR_SIMPLE);
+	return smartcard_ndr_write(s, ret->msz, ret->cBytes, 1, NDR_PTR_SIMPLE);
 }
 
 LONG smartcard_unpack_list_readers_call(SMARTCARD_DEVICE* smartcard, wStream* s,
@@ -2658,8 +2656,6 @@ LONG smartcard_pack_status_return(SMARTCARD_DEVICE* smartcard, wStream* s, const
                                   BOOL unicode)
 {
 	DWORD index = 0;
-	UINT32 size = unicode ? sizeof(WCHAR) : sizeof(CHAR);
-	size *= ret->cBytes;
 
 	smartcard_trace_status_return(smartcard, ret, unicode);
 	if (ret->ReturnCode != SCARD_S_SUCCESS)
@@ -2668,8 +2664,8 @@ LONG smartcard_pack_status_return(SMARTCARD_DEVICE* smartcard, wStream* s, const
 	if (!Stream_EnsureRemainingCapacity(s, 4))
 		return SCARD_F_INTERNAL_ERROR;
 
-	Stream_Write_UINT32(s, size); /* cBytes (4 bytes) */
-	if (!smartcard_ndr_pointer_write(s, &index, size))
+	Stream_Write_UINT32(s, ret->cBytes); /* cBytes (4 bytes) */
+	if (!smartcard_ndr_pointer_write(s, &index, ret->cBytes))
 		return SCARD_E_NO_MEMORY;
 
 	if (!Stream_EnsureRemainingCapacity(s, 44))
@@ -2679,7 +2675,7 @@ LONG smartcard_pack_status_return(SMARTCARD_DEVICE* smartcard, wStream* s, const
 	Stream_Write_UINT32(s, ret->dwProtocol); /* dwProtocol (4 bytes) */
 	Stream_Write(s, ret->pbAtr, sizeof(ret->pbAtr)); /* pbAtr (32 bytes) */
 	Stream_Write_UINT32(s, ret->cbAtrLen);   /* cbAtrLen (4 bytes) */
-	return smartcard_ndr_write(s, ret->mszReaderNames, size, 1, NDR_PTR_SIMPLE);
+	return smartcard_ndr_write(s, ret->mszReaderNames, ret->cBytes, 1, NDR_PTR_SIMPLE);
 }
 
 LONG smartcard_unpack_get_attrib_call(SMARTCARD_DEVICE* smartcard, wStream* s, GetAttrib_Call* call)