diff --git a/xs/xsp/Print.xsp b/xs/xsp/Print.xsp
index 3d2d2ad4f9..426e948dd9 100644
--- a/xs/xsp/Print.xsp
+++ b/xs/xsp/Print.xsp
@@ -176,7 +176,7 @@ _constant()
             try {
                 THIS->validate();
             } catch (PrintValidationException &e) {
-                croak(e.what());
+                croak("%s\n", e.what());
             }
         %};
 %{