diff --git a/CHANGELOG.md b/CHANGELOG.md
index f817060d0419de6c2277285f1ede0a041b05567a..b9a171d8c2666edefe2e51120cb7fbad70a33b9d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Changes in version 4.?-?.?.? - 2017-??-??
 
+ * Medium changes
+   - Only set the "running" field in a bridge's details document to
+     true if the bridge is both contained in the last known bridge
+     network status and has the "Running" flag assigned there.
+
  * Minor changes
    - Remove placeholder page on index.html.
 
diff --git a/src/main/java/org/torproject/onionoo/updater/NodeDetailsStatusUpdater.java b/src/main/java/org/torproject/onionoo/updater/NodeDetailsStatusUpdater.java
index 9fcff35e17c2bc216b6c1086f9b8091b34e0ea52..ff14d75813149c8ad65c26c1f7ffaa165c467bbb 100644
--- a/src/main/java/org/torproject/onionoo/updater/NodeDetailsStatusUpdater.java
+++ b/src/main/java/org/torproject/onionoo/updater/NodeDetailsStatusUpdater.java
@@ -863,7 +863,8 @@ public class NodeDetailsStatusUpdater implements DescriptorListener,
       }
 
       detailsStatus.setRelay(nodeStatus.isRelay());
-      detailsStatus.setRunning(nodeStatus.getLastSeenMillis()
+      detailsStatus.setRunning(nodeStatus.getRelayFlags().contains("Running")
+          && nodeStatus.getLastSeenMillis()
           == (nodeStatus.isRelay() ? this.relaysLastValidAfterMillis
           : this.bridgesLastPublishedMillis));
       detailsStatus.setNickname(nodeStatus.getNickname());