diff --git a/src/core/operations/FromBase85.mjs b/src/core/operations/FromBase85.mjs
index 42f37a1c..22033f99 100644
--- a/src/core/operations/FromBase85.mjs
+++ b/src/core/operations/FromBase85.mjs
@@ -36,17 +36,14 @@ class FromBase85 extends Operation {
         this.checks = [
             {
                 pattern: "^\\s*(?:<~)?(?:(?:\\s*[!-u]){5}|\\s*z)+[!-u\\s]*(?:~>)?\\s*$",
-                flags: "i",
                 args: ["!-u"]
             },
             {
                 pattern: "^(?:\\s*[0-9a-zA-Z.\\-:+=^!/*?&<>()[\\]{}@%$#])+\\s*$",
-                flags: "i",
                 args: ["0-9a-zA-Z.\\-:+=^!/*?&<>()[]{}@%$#"]
             },
             {
                 pattern: "^(?:\\s*[0-9A-Za-z!#$%&()*+\\-;<=>?@^_`{|}~])+\\s*$",
-                flags: "i",
                 args: ["0-9A-Za-z!#$%&()*+\\-;<=>?@^_`{|}~"]
             },
         ];