diff --git a/Mu2eG4/geom/geom_common_no_field.txt b/Mu2eG4/geom/geom_common_no_field.txt
new file mode 100644
index 0000000000..26b16877a1
--- /dev/null
+++ b/Mu2eG4/geom/geom_common_no_field.txt
@@ -0,0 +1,11 @@
+//
+// Variant on geom_common.txt with all magnetic fields turned off.
+//
+
+#include "Offline/Mu2eG4/geom/geom_common.txt"
+#include "Offline/Mu2eG4/geom/bfgeom_no_field.txt"
+
+// This tells emacs to view this file in c++ mode.
+// Local Variables:
+// mode:c++
+// End: