diff --git a/scripts/iso_build.include b/scripts/iso_build.include
index 6e81089..e108d71 100644
--- a/scripts/iso_build.include
+++ b/scripts/iso_build.include
@@ -1,7 +1,7 @@
 #!/bin/sh
 
 ISO_BUILD_LOCK=/tmp/.daily_iso_build.sh.lock
-LOCK_TIMEOUT=$((3600 * 12)) # 12 hours
+LOCK_TIMEOUT=$((3600 * 24)) # 24 hours
 
 kill_stale_process() {
     echo "[kill] NOT killing stale processes automatically: " >&2