diff --git a/src/blockfile/SimpleBlockFile.cpp b/src/blockfile/SimpleBlockFile.cpp
index ee2143bb2..7b463880a 100644
--- a/src/blockfile/SimpleBlockFile.cpp
+++ b/src/blockfile/SimpleBlockFile.cpp
@@ -491,7 +491,7 @@ BlockFile *SimpleBlockFile::BuildFromXML(DirManager &dm, const wxChar **attrs)
       if (!wxStricmp(attr, wxT("filename")) && 
             // Can't use XMLValueChecker::IsGoodFileName here, but do part of its test.
             XMLValueChecker::IsGoodFileString(strValue) && 
-            (strValue.Length() + 1 + dm.GetProjectDataDir().Length() <= MAX_PATH))
+            (strValue.Length() + 1 + dm.GetProjectDataDir().Length() <= PLATFORM_MAX_PATH))
       {
          if (!dm.AssignFile(fileName, strValue, false))
             // Make sure fileName is back to uninitialized state so we can detect problem later.