diff --git a/contrib/fb303/TClientInfo.cpp b/contrib/fb303/TClientInfo.cpp
index a4b00cf..c30b42b 100644
--- a/contrib/fb303/TClientInfo.cpp
+++ b/contrib/fb303/TClientInfo.cpp
@@ -149,7 +149,7 @@
     char addrBuf[INET6_ADDRSTRLEN];
     const char* addrStr = info->getAddr(addrBuf, sizeof addrBuf);
     if (addrStr == nullptr) {
-      // cerr << "no addr!" << endl;
+      // cerr << "no addr!" << '\n';
       continue;
     }
 
@@ -160,7 +160,7 @@
     char buf[256];
     snprintf(buf, sizeof buf, "%d %s %s %.3f %llu", i, addrStr, callStr, secs,
              (uint64_t)info->getNCalls());
-               
+
     result.push_back(buf);
   }
 }
diff --git a/contrib/fb303/cpp/ServiceTracker.cpp b/contrib/fb303/cpp/ServiceTracker.cpp
index a2e670c..43e8847 100644
--- a/contrib/fb303/cpp/ServiceTracker.cpp
+++ b/contrib/fb303/cpp/ServiceTracker.cpp
@@ -344,7 +344,7 @@
       break;
     }
     cout << '[' << level_string << "] [" << now_pretty << "] "
-         << message << endl;
+         << message << '\n';
   }
 }
 
diff --git a/contrib/thrift_dump.cpp b/contrib/thrift_dump.cpp
index 59c8ac8..01864d0 100644
--- a/contrib/thrift_dump.cpp
+++ b/contrib/thrift_dump.cpp
@@ -80,12 +80,12 @@
       }
     }
   } catch (TProtocolException exn) {
-    cout << "Protocol Exception: " << exn.what() << endl;
+    cout << "Protocol Exception: " << exn.what() << '\n';
   } catch (...) {
     oprot->getTransport()->flush();
   }
 
-  cout << endl;
+  cout << '\n';
 
   return 0;
 }
diff --git a/contrib/zeromq/test-client.cpp b/contrib/zeromq/test-client.cpp
index 159c250..f2bd213 100644
--- a/contrib/zeromq/test-client.cpp
+++ b/contrib/zeromq/test-client.cpp
@@ -33,7 +33,7 @@
     usleep(50000);
   } else {
     int value = client.get();
-    std::cout << value << std::endl;
+    std::cout << value << '\n';
   }
 
   return 0;