diff --git a/dlls/ntdll/ntdll.spec b/dlls/ntdll/ntdll.spec
index 3304ead6ff5..e10d7ca13ea 100644
--- a/dlls/ntdll/ntdll.spec
+++ b/dlls/ntdll/ntdll.spec
@@ -684,11 +684,11 @@
 # @ stub RtlInvertRangeList
 # @ stub RtlIpv4AddressToStringA
 # @ stub RtlIpv4AddressToStringExA
-# @ stub RtlIpv4AddressToStringExW
+@ stdcall RtlIpv4AddressToStringExW(ptr ptr ptr ptr)
 # @ stub RtlIpv4AddressToStringW
 # @ stub RtlIpv4StringToAddressA
 # @ stub RtlIpv4StringToAddressExA
-# @ stub RtlIpv4StringToAddressExW
+@ stdcall RtlIpv4StringToAddressExW(ptr ptr wstr ptr)
 # @ stub RtlIpv4StringToAddressW
 # @ stub RtlIpv6AddressToStringA
 # @ stub RtlIpv6AddressToStringExA
diff --git a/dlls/ntdll/rtl.c b/dlls/ntdll/rtl.c
index 0881c979e9b..e4492c080f6 100644
--- a/dlls/ntdll/rtl.c
+++ b/dlls/ntdll/rtl.c
@@ -860,3 +860,19 @@ void WINAPI RtlCopyLuidAndAttributesArray(
 
     for (i = 0; i < Count; i++) Dest[i] = Src[i];
 }
+
+NTSTATUS WINAPI RtlIpv4StringToAddressExW(PULONG IP, PULONG Port,
+                                          LPCWSTR Buffer, PULONG MaxSize)
+{
+    FIXME("(%p,%p,%p,%p): stub\n", IP, Port, Buffer, MaxSize);
+
+    return STATUS_SUCCESS;
+}
+
+NTSTATUS WINAPI RtlIpv4AddressToStringExW (PULONG IP, PULONG Port,
+                                           LPWSTR Buffer, PULONG MaxSize)
+{
+    FIXME("(%p,%p,%p,%p): stub\n", IP, Port, Buffer, MaxSize);
+
+    return STATUS_SUCCESS;
+}