diff --git a/man/ttyd.1 b/man/ttyd.1
index 83ba5f5d..96dfea8b 100644
--- a/man/ttyd.1
+++ b/man/ttyd.1
@@ -115,7 +115,7 @@ Cross platform: macOS, Linux, FreeBSD/OpenBSD, OpenWrt/LEDE, Windows
 
 .PP
 -P, --ping-interval
-      Websocket ping interval(sec) (default: 300)
+      Websocket ping interval(sec) (default: 5)
 
 .PP
 -6, --ipv6
diff --git a/man/ttyd.man.md b/man/ttyd.man.md
index 8ff9c424..b587aadd 100644
--- a/man/ttyd.man.md
+++ b/man/ttyd.man.md
@@ -78,7 +78,7 @@ ttyd 1 "September 2016" ttyd "User Manual"
       Expected base path for requests coming from a reverse proxy (eg: /mounted/here, max length: 128)
 
   -P, --ping-interval
-      Websocket ping interval(sec) (default: 300)
+      Websocket ping interval(sec) (default: 5)
 
   -6, --ipv6
       Enable IPv6 support