diff --git a/gtsam/hybrid/HybridFactor.cpp b/gtsam/hybrid/HybridFactor.cpp
index 5871a1303..a9fe62cf1 100644
--- a/gtsam/hybrid/HybridFactor.cpp
+++ b/gtsam/hybrid/HybridFactor.cpp
@@ -95,11 +95,15 @@ void HybridFactor::print(const std::string &s,
     if (c < continuousKeys_.size() - 1) {
       std::cout << " ";
     } else {
-      std::cout << (discreteKeys_.size() > 0 ? ";" : "");
+      std::cout << (discreteKeys_.size() > 0 ? "; " : "");
     }
   }
-  for (auto &&discreteKey : discreteKeys_) {
-    std::cout << " " << formatter(discreteKey.first);
+  for (size_t d = 0; d < discreteKeys_.size(); d++) {
+    std::cout << formatter(discreteKeys_.at(d).first);
+    if (d < discreteKeys_.size() - 1) {
+      std::cout << " ";
+    }
+    
   }
   std::cout << "]";
 }