diff --git a/blocking.py b/blocking.py
index 68b1e3e74..eb1c7cc7a 100644
--- a/blocking.py
+++ b/blocking.py
@@ -537,6 +537,8 @@ def mutePost(baseDir: str, nickname: str, domain: str, port: int,
                         del recentPostsCache['html'][postId]
                 print('MUTE: ' + postId +
                       ' marked as muted in recent posts memory cache')
+            if recentPostsCache['html'].get(postId):
+                del recentPostsCache['html'][postId]
 
 
 def unmutePost(baseDir: str, nickname: str, domain: str, port: int,
@@ -613,6 +615,8 @@ def unmutePost(baseDir: str, nickname: str, domain: str, port: int,
                         del recentPostsCache['html'][postId]
                 print('UNMUTE: ' + postId +
                       ' marked as unmuted in recent posts cache')
+            if recentPostsCache['html'].get(postId):
+                del recentPostsCache['html'][postId]
 
 
 def outboxMute(baseDir: str, httpPrefix: str,