diff --git a/upgrade-v1.0x-v1.1x.sh b/upgrade-v1.0x-v1.1x.sh
index f0b4b14..7efdf09 100755
--- a/upgrade-v1.0x-v1.1x.sh
+++ b/upgrade-v1.0x-v1.1x.sh
@@ -6,7 +6,7 @@ AUTHOR="(L) 2015 by Orsiris \"Ozy\" de Jong"
 CONTACT="http://www.netpower.fr/osync - ozy@netpower.fr"
 OLD_PROGRAM_VERSION="1.0x"
 NEW_PROGRAM_VERSION="v1.1x"
-PROGRAM_BUILD=2015121502
+PROGRAM_BUILD=2016020801
 
 function Init {
 	OSYNC_DIR=".osync_workdir"
@@ -329,10 +329,25 @@ function RewriteConfigFiles {
 	sed -i 's/^SYNC_ID=/INSTANCE_ID=/g' "$config_file"
 
 	# Add missing config file values
-	sed -i '/^LOGFILE=*/a RSYNC_PATTERN_FIRST=include' "$config_file"
-	sed -i '/^RSYNC_EXCLUDE_PATTERN=*/a RSYNC_INCLUDE_PATTERN=""' "$config_file"
-	sed -i '/^RSYNC_EXCLUDE_FROM=*/a RSYNC_INCLUDE_FROM=""' "$config_file"
-	sed -i '/^PARTIAL=*/a DELTA_COPIES=yes' "$config_file"
+	if ! grep "RSYNC_PATTERN_FIRST=" "$config_file" > /dev/null; then
+		sed -i '/^LOGFILE=*/a RSYNC_PATTERN_FIRST=include' "$config_file"
+	fi
+
+	if ! grep "RSYNC_INCLUDE_PATTERN=" "$config_file" > /dev/null; then
+		sed -i '/^RSYNC_EXCLUDE_PATTERN=*/a RSYNC_INCLUDE_PATTERN=""' "$config_file"
+	fi
+
+	if ! grep "RSYNC_INCLUDE_FROM=" "$config_file" > /dev/null; then
+		sed -i '/^RSYNC_EXCLUDE_FROM=*/a RSYNC_INCLUDE_FROM=""' "$config_file"
+	fi
+
+	if ! grep "PARTIAL=" "$config_file" > /dev/null; then
+		sed -i '/^FORCE_STRANGER_LOCK_RESUME=*/a PARTIAL=no' "$config_file"
+	fi
+
+	if ! grep "DELTA_COPIES=" "$config_file" > /dev/null; then
+		sed -i '/^PARTIAL=*/a DELTA_COPIES=yes' "$config_file"
+	fi
 }
 
 _QUICKSYNC=0