diff --git a/dlls/dnsapi/libresolv.c b/dlls/dnsapi/libresolv.c
index ac52147..0f8c2ef 100644
--- a/wine-6.15/dlls/dnsapi/libresolv.c
+++ b/wine-6.15/dlls/dnsapi/libresolv.c
@@ -57,6 +57,43 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(dnsapi);
 
+/* code from glibc's resolv/ns_name.c, with errno setting removed */
+/*%
+ *	Advance *ptrptr to skip over the compressed name it points at.
+ *
+ * return:
+ *\li	0 on success, -1 (with errno set) on failure.
+ */
+#ifndef __GLIBC__
+static int
+ns_name_skip(const u_char **ptrptr, const u_char *eom)
+{
+	const u_char *cp;
+	u_int n;
+
+	cp = *ptrptr;
+	while (cp < eom && (n = *cp++) != 0) {
+		/* Check for indirection. */
+		switch (n & NS_CMPRSFLGS) {
+		case 0:			/*%< normal case, n == len */
+			cp += n;
+			continue;
+		case NS_CMPRSFLGS:	/*%< indirection */
+			cp++;
+			break;
+		default:		/*%< illegal type */
+			return (-1);
+		}
+		break;
+	}
+	if (cp > eom) {
+		return (-1);
+	}
+	*ptrptr = cp;
+	return (0);
+}
+#endif
+
 static const char *debugstr_type( unsigned short type )
 {
     const char *str;