diff --git a/Grid/qcd/utils/GaugeGroup.h b/Grid/qcd/utils/GaugeGroup.h
index 5f731cc2..f92064f4 100644
--- a/Grid/qcd/utils/GaugeGroup.h
+++ b/Grid/qcd/utils/GaugeGroup.h
@@ -151,8 +151,8 @@ class GaugeGroup {
   // The public part of the interface follows below and refers to these
   // private member functions.
 
-#include <Grid/qcd/utils/SUn.impl>
-#include <Grid/qcd/utils/Sp2n.impl>
+#include <Grid/qcd/utils/SUn.impl.h>
+#include <Grid/qcd/utils/Sp2n.impl.h>
 
  public:
   template <class cplx>