diff --git a/tools/quartus/run_app b/tools/quartus/run_app
index 2d87cb81040b59c0c35b234856d2a63e34c0463b..6da1d68dc1f8862ba410bca72481675677faa233 100755
--- a/tools/quartus/run_app
+++ b/tools/quartus/run_app
@@ -99,7 +99,7 @@ for arg ; do
             userflags="-DCOMPILE_FOR_QSYS"
             ;;
         use=gen2)
-            userflags="-DCOMPILE_FOR_GEN2"
+            userflags="-DCOMPILE_FOR_GEN2_UNB2"
             ;;
         *=* )
             # it was an option. skip it - if we wanted to,