diff --git a/src/core/operations/Malbolge.mjs b/src/core/operations/Malbolge.mjs
index 06b9f303..0dcef568 100644
--- a/src/core/operations/Malbolge.mjs
+++ b/src/core/operations/Malbolge.mjs
@@ -32,7 +32,7 @@ class Malbolge extends Operation {
     ];
     this.patterns = [
       {
-        match: '^(?:[\\x21-\\x7e)?$',
+        match: '^(?:[\\x21-\\x7e])?$',
         flags: 'i',
         args: []
       }