diff --git a/dlls/msi/action.c b/dlls/msi/action.c
index dbf48f4821b..7ee0518b408 100644
--- a/dlls/msi/action.c
+++ b/dlls/msi/action.c
@@ -3498,8 +3498,8 @@ static UINT ITERATE_SelfRegModules(MSIRECORD *row, LPVOID param)
     uipath = strdupW( file->TargetPath );
     p = strrchrW(uipath,'\\');
     if (p)
-        p[1]=0;
-    MSI_RecordSetStringW( uirow, 1, &p[2] );
+        p[0]=0;
+    MSI_RecordSetStringW( uirow, 1, &p[1] );
     MSI_RecordSetStringW( uirow, 2, uipath);
     ui_actiondata( package, szSelfRegModules, uirow);
     msiobj_release( &uirow->hdr );