diff --git a/find_duplicate_files/find_duplicate_files.py b/find_duplicate_files/find_duplicate_files.py
index 301f787..cdc528f 100644
--- a/find_duplicate_files/find_duplicate_files.py
+++ b/find_duplicate_files/find_duplicate_files.py
@@ -59,7 +59,8 @@ class find_duplicate_files:
         self.cache_db.commit()
 
     def _check_file_cache(self, file):
-        result = self.cur.execute(f"SELECT hash FROM files WHERE file = '{file}'")
+        file_sql = file.replace("'", "\'")
+        result = self.cur.execute(f"SELECT hash FROM files WHERE file = '{file_sql}'")
         row = result.fetchone()
         if row and len(row) > 0:
             return row[0]