--- libc/misc/wchar/wchar.c
+++ libc/misc/wchar/wchar.c
@@ -1350,14 +1350,19 @@
 				if (((px->fromcodeset & IC_UTF_16) == IC_UTF_16)
 					 && (((__uwchar_t)(wc - 0xd800U)) < (0xdc00U - 0xd800U))
 					) {			/* surrogate */
-					wc =- 0xd800U;
+					wc -= 0xd800U;
 					if (*inbytesleft < 4) goto INVALID;
 					wc2 = (((unsigned int)((unsigned char)((*inbuf)[2]))) << 8)
 						+ ((unsigned char)((*inbuf)[3]));
-					if (!(px->fromcodeset & 1)) wc = bswap_16(wc2);
-					if (((__uwchar_t)(wc2 -= 0xdc00U)) < (0xe0000U - 0xdc00U)) {
-						goto ILLEGAL;
-					}
+					if (!(px->fromcodeset & 1)) wc2 = bswap_16(wc2);
+					/* DDO: Bedingung entfernt. Die unteren 10 Bit sind *immer* kleiner
+					 * 0x400 (0xe0000-0xdc00). Unklar, was hier getestet werden sollte.
+					 * Beispiel: UTF-16 Smiley 0xd83d 0xde09 */
+					wc2 -= 0xdc00U;
+					/*--- if (((__uwchar_t)(wc2 -= 0xdc00U)) < (0xe0000U - 0xdc00U)) { ---*/
+						/*--- __set_errno(EILSEQ); ---*/
+						/*--- goto ILLEGAL; ---*/
+					/*--- } ---*/
 					inci = 4;	/* Change inci here in case skipping illegals. */
 					wc = 0x10000UL + (wc << 10) + wc2;
 				}
@@ -1386,7 +1391,9 @@
 										 ? 0x7fffffffUL : 0x10ffffUL)
 #ifdef KUHN
 					|| (((__uwchar_t)(wc - 0xfffeU)) < 2)
-					|| (((__uwchar_t)(wc - 0xd800U)) < (0xe000U - 0xd800U))
+					/* DDO: Bedingung entfernt. Die unteren 10 Bit sind *immer* kleiner
+					 * 0x400 (0xe0000-0xdc00). Unklar, was hier getestet werden sollte. */
+					/*--- || (((__uwchar_t)(wc - 0xd800U)) < (0xe000U - 0xd800U)) ---*/
 #endif
 					) {
 					goto ILLEGAL;