diff --git a/dlls/advapi32/advapi32.spec b/dlls/advapi32/advapi32.spec
index 8b1c0d5ada5..ff2b0deb6c3 100644
--- a/dlls/advapi32/advapi32.spec
+++ b/dlls/advapi32/advapi32.spec
@@ -121,7 +121,7 @@
 # @ stub CreateCodeAuthzLevel
 @ stdcall CreatePrivateObjectSecurity(ptr ptr ptr long long ptr)
 # @ stub CreatePrivateObjectSecurityEx
-# @ stub CreatePrivateObjectSecurityWithMultipleInheritance
+@ stdcall CreatePrivateObjectSecurityWithMultipleInheritance(ptr ptr ptr ptr long long long long ptr)
 @ stdcall CreateProcessAsUserA(long str str ptr ptr long long ptr str ptr ptr)
 # @ stub CreateProcessAsUserSecure
 @ stdcall CreateProcessAsUserW(long wstr wstr ptr ptr long long ptr wstr ptr ptr)
diff --git a/dlls/advapi32/security.c b/dlls/advapi32/security.c
index e8f64d5219d..00dafe83cf4 100644
--- a/dlls/advapi32/security.c
+++ b/dlls/advapi32/security.c
@@ -5296,6 +5296,14 @@ BOOL WINAPI CreatePrivateObjectSecurity(
     return TRUE;
 }
 
+BOOL WINAPI CreatePrivateObjectSecurityWithMultipleInheritance(
+    PSECURITY_DESCRIPTOR parent, PSECURITY_DESCRIPTOR creator, PSECURITY_DESCRIPTOR *out,
+    GUID **types, ULONG count, BOOL is_container, ULONG flags, HANDLE token, PGENERIC_MAPPING mapping)
+{
+    FIXME(": semi-stub\n");
+    return CreatePrivateObjectSecurity(parent, creator, out, is_container, token, mapping);
+}
+
 BOOL WINAPI DestroyPrivateObjectSecurity( PSECURITY_DESCRIPTOR* ObjectDescriptor )
 {
     FIXME("%p - stub\n", ObjectDescriptor);
diff --git a/dlls/api-ms-win-downlevel-advapi32-l1-1-0/api-ms-win-downlevel-advapi32-l1-1-0.spec b/dlls/api-ms-win-downlevel-advapi32-l1-1-0/api-ms-win-downlevel-advapi32-l1-1-0.spec
index 130f28533d1..4105e59bf04 100644
--- a/dlls/api-ms-win-downlevel-advapi32-l1-1-0/api-ms-win-downlevel-advapi32-l1-1-0.spec
+++ b/dlls/api-ms-win-downlevel-advapi32-l1-1-0/api-ms-win-downlevel-advapi32-l1-1-0.spec
@@ -27,7 +27,7 @@
 @ stdcall CopySid(long ptr ptr) advapi32.CopySid
 @ stdcall CreatePrivateObjectSecurity(ptr ptr ptr long long ptr) advapi32.CreatePrivateObjectSecurity
 @ stub CreatePrivateObjectSecurityEx
-@ stub CreatePrivateObjectSecurityWithMultipleInheritance
+@ stdcall CreatePrivateObjectSecurityWithMultipleInheritance(ptr ptr ptr ptr long long long long ptr) advapi32.CreatePrivateObjectSecurityWithMultipleInheritance
 @ stdcall CreateProcessAsUserW(long wstr wstr ptr ptr long long ptr wstr ptr ptr) advapi32.CreateProcessAsUserW
 @ stdcall CreateRestrictedToken(long long long ptr long ptr long ptr ptr) advapi32.CreateRestrictedToken
 @ stdcall CreateWellKnownSid(long ptr ptr ptr) advapi32.CreateWellKnownSid
diff --git a/dlls/api-ms-win-security-base-l1-1-0/api-ms-win-security-base-l1-1-0.spec b/dlls/api-ms-win-security-base-l1-1-0/api-ms-win-security-base-l1-1-0.spec
index edae6d169a2..a44f5b84172 100644
--- a/dlls/api-ms-win-security-base-l1-1-0/api-ms-win-security-base-l1-1-0.spec
+++ b/dlls/api-ms-win-security-base-l1-1-0/api-ms-win-security-base-l1-1-0.spec
@@ -27,7 +27,7 @@
 @ stdcall CopySid(long ptr ptr) advapi32.CopySid
 @ stdcall CreatePrivateObjectSecurity(ptr ptr ptr long long ptr) advapi32.CreatePrivateObjectSecurity
 @ stub CreatePrivateObjectSecurityEx
-@ stub CreatePrivateObjectSecurityWithMultipleInheritance
+@ stdcall CreatePrivateObjectSecurityWithMultipleInheritance(ptr ptr ptr ptr long long long long ptr) advapi32.CreatePrivateObjectSecurityWithMultipleInheritance
 @ stdcall CreateRestrictedToken(long long long ptr long ptr long ptr ptr) advapi32.CreateRestrictedToken
 @ stdcall CreateWellKnownSid(long ptr ptr ptr) advapi32.CreateWellKnownSid
 @ stdcall DeleteAce(ptr long) advapi32.DeleteAce
diff --git a/dlls/api-ms-win-security-base-l1-2-0/api-ms-win-security-base-l1-2-0.spec b/dlls/api-ms-win-security-base-l1-2-0/api-ms-win-security-base-l1-2-0.spec
index e19fe53d4e5..02e3b9a644a 100644
--- a/dlls/api-ms-win-security-base-l1-2-0/api-ms-win-security-base-l1-2-0.spec
+++ b/dlls/api-ms-win-security-base-l1-2-0/api-ms-win-security-base-l1-2-0.spec
@@ -31,7 +31,7 @@
 @ stdcall CopySid(long ptr ptr) advapi32.CopySid
 @ stdcall CreatePrivateObjectSecurity(ptr ptr ptr long long ptr) advapi32.CreatePrivateObjectSecurity
 @ stub CreatePrivateObjectSecurityEx
-@ stub CreatePrivateObjectSecurityWithMultipleInheritance
+@ stdcall CreatePrivateObjectSecurityWithMultipleInheritance(ptr ptr ptr ptr long long long long ptr) advapi32.CreatePrivateObjectSecurityWithMultipleInheritance
 @ stdcall CreateRestrictedToken(long long long ptr long ptr long ptr ptr) advapi32.CreateRestrictedToken
 @ stdcall CreateWellKnownSid(long ptr ptr ptr) advapi32.CreateWellKnownSid
 @ stdcall DeleteAce(ptr long) advapi32.DeleteAce
diff --git a/include/winbase.h b/include/winbase.h
index b42bc0d5d8c..dd320c20999 100644
--- a/include/winbase.h
+++ b/include/winbase.h
@@ -1771,6 +1771,7 @@ WINBASEAPI HANDLE      WINAPI CreateNamedPipeW(LPCWSTR,DWORD,DWORD,DWORD,DWORD,D
 #define                       CreateNamedPipe WINELIB_NAME_AW(CreateNamedPipe)
 WINBASEAPI BOOL        WINAPI CreatePipe(PHANDLE,PHANDLE,LPSECURITY_ATTRIBUTES,DWORD);
 WINADVAPI  BOOL        WINAPI CreatePrivateObjectSecurity(PSECURITY_DESCRIPTOR,PSECURITY_DESCRIPTOR,PSECURITY_DESCRIPTOR*,BOOL,HANDLE,PGENERIC_MAPPING);
+WINADVAPI  BOOL        WINAPI CreatePrivateObjectSecurityWithMultipleInheritance(PSECURITY_DESCRIPTOR,PSECURITY_DESCRIPTOR,PSECURITY_DESCRIPTOR*,GUID**,ULONG,BOOL,ULONG,HANDLE,PGENERIC_MAPPING);
 WINBASEAPI PTP_POOL    WINAPI CreateThreadpool(PVOID);
 WINBASEAPI PTP_WORK    WINAPI CreateThreadpoolWork(PTP_WORK_CALLBACK,PVOID,PTP_CALLBACK_ENVIRON);
 WINBASEAPI BOOL        WINAPI CreateProcessA(LPCSTR,LPSTR,LPSECURITY_ATTRIBUTES,LPSECURITY_ATTRIBUTES,BOOL,DWORD,LPVOID,LPCSTR,LPSTARTUPINFOA,LPPROCESS_INFORMATION);