diff --git a/dlls/api-ms-win-core-namespace-l1-1-0/api-ms-win-core-namespace-l1-1-0.spec b/dlls/api-ms-win-core-namespace-l1-1-0/api-ms-win-core-namespace-l1-1-0.spec
index ebb41489dc7..df6ff599396 100644
--- a/dlls/api-ms-win-core-namespace-l1-1-0/api-ms-win-core-namespace-l1-1-0.spec
+++ b/dlls/api-ms-win-core-namespace-l1-1-0/api-ms-win-core-namespace-l1-1-0.spec
@@ -1,6 +1,6 @@
 @ stub AddSIDToBoundaryDescriptor
 @ stub ClosePrivateNamespace
-@ stub CreateBoundaryDescriptorW
+@ stdcall CreateBoundaryDescriptorW(wstr long) kernel32.CreateBoundaryDescriptorW
 @ stub CreatePrivateNamespaceW
 @ stub DeleteBoundaryDescriptor
 @ stub OpenPrivateNamespaceW
diff --git a/dlls/kernel32/kernel32.spec b/dlls/kernel32/kernel32.spec
index 0e5f953aa50..6c487c86bd2 100644
--- a/dlls/kernel32/kernel32.spec
+++ b/dlls/kernel32/kernel32.spec
@@ -267,7 +267,7 @@
 @ stdcall CreateActCtxA(ptr)
 @ stdcall -import CreateActCtxW(ptr)
 # @ stub CreateBoundaryDescriptorA
-# @ stub CreateBoundaryDescriptorW
+@ stdcall -import CreateBoundaryDescriptorW(wstr long)
 @ stdcall -import CreateConsoleScreenBuffer(long long ptr long ptr)
 @ stdcall -import CreateDirectoryA(str ptr)
 @ stdcall CreateDirectoryExA(str str ptr)
diff --git a/dlls/kernelbase/kernelbase.spec b/dlls/kernelbase/kernelbase.spec
index da3d5e4035b..a118ab84ef8 100644
--- a/dlls/kernelbase/kernelbase.spec
+++ b/dlls/kernelbase/kernelbase.spec
@@ -174,7 +174,7 @@
 # @ stub CouldMultiUserAppsBehaviorBePossibleForPackage
 @ stdcall CreateActCtxW(ptr)
 # @ stub CreateAppContainerToken
-# @ stub CreateBoundaryDescriptorW
+@ stdcall CreateBoundaryDescriptorW(wstr long)
 @ stdcall CreateConsoleScreenBuffer(long long ptr long ptr)
 @ stdcall CreateDirectoryA(str ptr)
 @ stdcall CreateDirectoryExW(wstr wstr ptr)
diff --git a/dlls/kernelbase/security.c b/dlls/kernelbase/security.c
index 71e09bdefb5..d5f5280e979 100644
--- a/dlls/kernelbase/security.c
+++ b/dlls/kernelbase/security.c
@@ -922,6 +922,15 @@ BOOL WINAPI ConvertToAutoInheritPrivateObjectSecurity( PSECURITY_DESCRIPTOR pare
     return set_ntstatus( RtlConvertToAutoInheritSecurityObject( parent, current, descr, type, is_dir, mapping ));
 }
 
+/******************************************************************************
+ * CreateBoundaryDescriptorW    (kernelbase.@)
+ */
+HANDLE WINAPI CreateBoundaryDescriptorW( LPCWSTR name, ULONG flags )
+{
+    FIXME("%s %u - stub\n", debugstr_w(name), flags);
+    return NULL;
+}
+
 /******************************************************************************
  * CreatePrivateObjectSecurity    (kernelbase.@)
  */