diff --git a/files/assets/js/submit.js b/files/assets/js/submit.js
index 55cef160d..e836b11ba 100644
--- a/files/assets/js/submit.js
+++ b/files/assets/js/submit.js
@@ -163,8 +163,9 @@ function checkRepost() {
 	const system = document.getElementById('system')
 	system.innerHTML = `To post an image, use a direct image link such as i.imgur.com`;
 	const url = document.getElementById('post-url').value
+	const min_repost_check = 9;
 
-	if (url) {
+	if (url && url.length >= min_repost_check) {
 		const xhr = new XMLHttpRequest();
 		xhr.open("post", "/is_repost");
 		xhr.setRequestHeader('xhr', 'xhr');
diff --git a/files/helpers/const.py b/files/helpers/const.py
index a704e70eb..0a9295eb4 100644
--- a/files/helpers/const.py
+++ b/files/helpers/const.py
@@ -333,6 +333,7 @@ COMMENT_BODY_LENGTH_LIMIT = 10000 # do not make larger than 10000 characters wit
 COMMENT_BODY_HTML_LENGTH_LIMIT = 20000 # do not make larger than 20000 characters without altering the table
 COMMENT_MAX_DEPTH = 200
 TRANSFER_MESSAGE_LENGTH_LIMIT = 200 # do not make larger than 10000 characters (comment limit) without altering the table
+MIN_REPOST_CHECK_URL_LENGTH = 9 # also change the constant in checkRepost() of submit.js
 
 LOGGEDIN_ACTIVE_TIME = 15 * 60
 PFP_DEFAULT_MARSEY = True
diff --git a/files/routes/posts.py b/files/routes/posts.py
index e06a8186f..5701fcdf7 100644
--- a/files/routes/posts.py
+++ b/files/routes/posts.py
@@ -652,11 +652,12 @@ def thumbnail_thread(pid):
 
 @app.post("/is_repost")
 def is_repost():
+	not_a_repost = {'permalink': ''}
 	if not FEATURES['REPOST_DETECTION']:
-		return {'permalink': ''}
+		return not_a_repost
 
 	url = request.values.get('url')
-	if not url: abort(400)
+	if not url or len(url) < MIN_REPOST_CHECK_URL_LENGTH: abort(400)
 
 	url = normalize_url(url)
 	parsed_url = urlparse(url)
@@ -681,7 +682,6 @@ def is_repost():
 							fragment=parsed_url.fragment)
 	
 	url = urlunparse(new_url)
-
 	url = url.rstrip('/')
 
 	search_url = url.replace('%', '').replace('\\', '').replace('_', '\_').strip()
@@ -691,7 +691,7 @@ def is_repost():
 		Submission.is_banned == False
 	).first()
 	if repost: return {'permalink': repost.permalink}
-	else: return {'permalink': ''}
+	else: return not_a_repost
 
 @app.post("/submit")
 @app.post("/h/<sub>/submit")