diff --git a/doc/configuration.rst b/doc/configuration.rst
index 035a481..ce38745 100644
--- a/doc/configuration.rst
+++ b/doc/configuration.rst
@@ -1261,6 +1261,17 @@ validate new project name.
 Defaults to: ``^[a-zA-z0-9_][a-zA-Z0-9-_]*$``
 
 
+FILE_SIZE_HIGHLIGHT
+~~~~~~~~~~~~~~~~~~~
+
+This configuration key allows to specify the maximum number of characters a file
+or diff should have to have syntax highlighting. Everything above this limit
+will not have syntax highlighting as this is a memory intensive procedure that
+easily leads to out of memory error on large files or diff.
+
+Defaults to: 5000
+
+
 Deprecated configuration keys
 -----------------------------
 
diff --git a/pagure/ui/repo.py b/pagure/ui/repo.py
index 2574c94..c4840b5 100644
--- a/pagure/ui/repo.py
+++ b/pagure/ui/repo.py
@@ -70,10 +70,6 @@ from pagure.decorators import (
 _log = logging.getLogger(__name__)
 
 
-# Number of characters to determine that a file is "huge"
-# Huge files will not get syntax highlighting
-HUGEFILE = 5000
-
 
 def get_git_url_ssh():
     """ Return the GIT SSH URL to be displayed in the UI based on the
@@ -560,7 +556,8 @@ def view_file(repo, identifier, filename, username=None, namespace=None):
             content, safe = pagure.doc_utils.convert_readme(content.data, ext)
             output_type = 'markup'
         elif 'data' in dir(content) \
-                and len(content.data) < HUGEFILE \
+                and len(content.data) < pagure_config.get(
+                    'FILE_SIZE_HIGHLIGHT', 5000) \
                 and not isbinary:
             file_content = None
             try: