--- a/browser/components/migration/MSMigrationUtils.jsm
+++ b/browser/components/migration/MSMigrationUtils.jsm
@@ -74,17 +74,17 @@ function CtypesKernelHelpers() {
     {dwHighDateTime: wintypes.DWORD}
   ]);
 
   try {
     this._libs.kernel32 = ctypes.open("Kernel32");
 
     this._functions.FileTimeToSystemTime =
       this._libs.kernel32.declare("FileTimeToSystemTime",
-                                  ctypes.default_abi,
+                                  ctypes.winapi_abi,
                                   wintypes.BOOL,
                                   this._structs.FILETIME.ptr,
                                   this._structs.SYSTEMTIME.ptr);
   } catch (ex) {
     this.finalize();
   }
 }