diff --git a/platform/cervantes/koreader.sh b/platform/cervantes/koreader.sh
index 29470e41b..961d73128 100755
--- a/platform/cervantes/koreader.sh
+++ b/platform/cervantes/koreader.sh
@@ -34,6 +34,8 @@ ko_update_check() {
         fi
         rm -f "${NEWUPDATE}" # always purge newupdate in all cases to prevent update loop
         unset BLOCKS CPOINTS
+        # Ensure everything is flushed to disk before we restart. This *will* stall for a while on slow storage!
+        sync
     fi
 }
 
diff --git a/platform/kindle/koreader.sh b/platform/kindle/koreader.sh
index 576588fbb..db82f15cb 100755
--- a/platform/kindle/koreader.sh
+++ b/platform/kindle/koreader.sh
@@ -134,6 +134,8 @@ ko_update_check() {
         fi
         rm -f "${NEWUPDATE}" # always purge newupdate in all cases to prevent update loop
         unset BLOCKS CPOINTS
+        # Ensure everything is flushed to disk before we restart. This *will* stall for a while on slow storage!
+        sync
     fi
 }
 # NOTE: Keep doing an initial update check, in addition to one during the restart loop, so we can pickup potential updates of this very script...
diff --git a/platform/kobo/koreader.sh b/platform/kobo/koreader.sh
index 8725813b9..f48256655 100755
--- a/platform/kobo/koreader.sh
+++ b/platform/kobo/koreader.sh
@@ -49,6 +49,8 @@ ko_update_check() {
         fi
         rm -f "${NEWUPDATE}" # always purge newupdate in all cases to prevent update loop
         unset BLOCKS CPOINTS
+        # Ensure everything is flushed to disk before we restart. This *will* stall for a while on slow storage!
+        sync
     fi
 }
 # NOTE: Keep doing an initial update check, in addition to one during the restart loop, so we can pickup potential updates of this very script...