diff --git a/lib/qcd/QCD.h b/lib/qcd/QCD.h
index 16f82af1..e1e38e82 100644
--- a/lib/qcd/QCD.h
+++ b/lib/qcd/QCD.h
@@ -51,7 +51,7 @@ namespace QCD {
 
     static const int Nc=3;
     static const int Ns=4;
-    static const int Nd=2;
+    static const int Nd=4;
     static const int Nhs=2; // half spinor
     static const int Nds=8; // double stored gauge field
     static const int Ngp=2; // gparity index range