diff --git a/.maintain/gitlab/check_line_width.sh b/.maintain/gitlab/check_line_width.sh
index 85092260b6a64..611d3ae2681e2 100755
--- a/.maintain/gitlab/check_line_width.sh
+++ b/.maintain/gitlab/check_line_width.sh
@@ -10,14 +10,15 @@ BASE_BRANCH_NAME="master"
 LINE_WIDTH="120"
 GOOD_LINE_WIDTH="100"
 BASE_BRANCH="${BASE_ORIGIN}/${BASE_BRANCH_NAME}"
+git fetch ${BASE_ORIGIN} ${BASE_BRANCH_NAME} --depth 100
+BASE_HASH=$(git merge-base ${BASE_BRANCH} HEAD)
 
-git fetch ${BASE_ORIGIN} ${BASE_BRANCH_NAME} --depth 1
-git diff --name-only ${BASE_BRANCH} -- \*.rs | ( while read file
+git diff --name-only ${BASE_HASH} -- \*.rs | ( while read file
 do
   if [ ! -f ${file} ];
   then
 	echo "Skipping removed file."
-  elif git diff ${BASE_BRANCH} -- ${file} | grep -q "^+.\{$(( $LINE_WIDTH + 1 ))\}"
+  elif git diff ${BASE_HASH} -- ${file} | grep -q "^+.\{$(( $LINE_WIDTH + 1 ))\}"
   then
     if [ -z "${FAIL}" ]
     then
@@ -29,11 +30,11 @@ do
       FAIL="true"
     fi
     echo "| file: ${file}"
-    git diff ${BASE_BRANCH} -- ${file} \
+    git diff ${BASE_HASH} -- ${file} \
       | grep -n "^+.\{$(( $LINE_WIDTH + 1))\}"
     echo "|"
   else
-    if git diff ${BASE_BRANCH} -- ${file} | grep -q "^+.\{$(( $GOOD_LINE_WIDTH + 1 ))\}"
+    if git diff ${BASE_HASH} -- ${file} | grep -q "^+.\{$(( $GOOD_LINE_WIDTH + 1 ))\}"
     then
       if [ -z "${FAIL}" ]
       then
@@ -44,7 +45,7 @@ do
         echo "|"
       fi
       echo "| file: ${file}"
-      git diff ${BASE_BRANCH} -- ${file} | grep -n "^+.\{$(( $GOOD_LINE_WIDTH + 1 ))\}"
+      git diff ${BASE_HASH} -- ${file} | grep -n "^+.\{$(( $GOOD_LINE_WIDTH + 1 ))\}"
       echo "|"
     fi
   fi