diff --git a/cpp/switchchain_exponent.cpp b/cpp/switchchain_exponent.cpp
index 5510c28bcd1021e4233b79d864c5b07f245f4b88..303d3baf0b2abff5292923a39d792bd4635726bb 100644
--- a/cpp/switchchain_exponent.cpp
+++ b/cpp/switchchain_exponent.cpp
@@ -121,6 +121,6 @@ int main(int argc, char* argv[]) {
             }
         }
     }
-    outfile << ',' << '}';
+    outfile << '\n' << '}';
     return 0;
 }