diff --git a/dlls/msi/custom.c b/dlls/msi/custom.c
index cf1e60bc64b..0b887d56dc6 100644
--- a/dlls/msi/custom.c
+++ b/dlls/msi/custom.c
@@ -689,6 +689,8 @@ static DWORD WINAPI ACTION_CallDllFunction( const GUID *guid )
             TRACE("calling %s\n", debugstr_w( function ) );
             handle_msi_break( function );
 
+            CoInitialize(NULL);
+
             __TRY
             {
                 r = fn( hPackage );
@@ -701,6 +703,8 @@ static DWORD WINAPI ACTION_CallDllFunction( const GUID *guid )
             }
             __ENDTRY;
 
+            CoUninitialize();
+
             MsiCloseHandle( hPackage );
         }
         else