diff --git a/dlls/kernel32/kernel32.spec b/dlls/kernel32/kernel32.spec
index b55562186fe..17344600ab4 100644
--- a/dlls/kernel32/kernel32.spec
+++ b/dlls/kernel32/kernel32.spec
@@ -928,6 +928,7 @@
 @ stdcall -arch=x86_64 RtlLookupFunctionEntry(long ptr ptr) ntdll.RtlLookupFunctionEntry
 @ stdcall RtlMoveMemory(ptr ptr long) ntdll.RtlMoveMemory
 @ stdcall RtlUnwind(ptr ptr ptr long) ntdll.RtlUnwind
+@ stdcall -arch=x86_64 RtlUnwindEx(long long ptr long ptr) ntdll.RtlUnwindEx
 @ stdcall -arch=x86_64 RtlVirtualUnwind(long long long ptr ptr ptr ptr ptr) ntdll.RtlVirtualUnwind
 @ stdcall RtlZeroMemory(ptr long) ntdll.RtlZeroMemory
 @ stdcall -i386 -norelay SMapLS()