diff --git a/src/XOGLUtils.cpp b/src/XOGLUtils.cpp
index 693683279..2b7d637d6 100644
--- a/src/XOGLUtils.cpp
+++ b/src/XOGLUtils.cpp
@@ -60,9 +60,12 @@ OSStatus aglInitEntryPoints (void)
     fileRefParam.ioNamePtr  = frameworkName;
     fileRefParam.newRef = &fileRef;
 
+    // For some reason an explicit cast satisfies gcc TDG
+    SInt32 fileRefParamIO_DirID = static_cast<SInt32>(fileRefParam.ioDirID);
+
     // Frameworks directory/folder
     err = FindFolder (kSystemDomain, kFrameworksFolderType, false,
-                      &fileRefParam.ioVRefNum, &fileRefParam.ioDirID);
+                      &fileRefParam.ioVRefNum, &fileRefParamIO_DirID);
     if (noErr != err) {
         return err;
     }