diff --git a/src/core/operations/RemoveDiacritics.mjs b/src/core/operations/RemoveDiacritics.mjs
index 859d86d7..4ab2df2c 100644
--- a/src/core/operations/RemoveDiacritics.mjs
+++ b/src/core/operations/RemoveDiacritics.mjs
@@ -33,7 +33,9 @@ class RemoveDiacritics extends Operation {
      */
     run(input, args) {
         // reference: https://stackoverflow.com/questions/990904/remove-accents-diacritics-in-a-string-in-javascript/37511463
-        return input.normalize("NFD").replace(/[\u0300-\u036f]/g, "");
+        return input.normalize("NFD")
+            .replace(/\u0142/g, "l").replace(/\u0141/g, "L")
+            .replace(/[\u0300-\u036f]/g, "");
     }
 
 }
diff --git a/tests/operations/tests/Unicode.mjs b/tests/operations/tests/Unicode.mjs
index 2603768f..f801b765 100644
--- a/tests/operations/tests/Unicode.mjs
+++ b/tests/operations/tests/Unicode.mjs
@@ -80,4 +80,15 @@ TestRegister.addTests([
             },
         ],
     },
+    {
+        name: "Remove Diacritics: polish letter ł",
+        input: "zażółć gęślą jaźń ZAŻÓŁĆ GĘŚLĄ JAŹŃ",
+        expectedOutput: "zazolc gesla jazn ZAZOLC GESLA JAZN",
+        recipeConfig: [
+            {
+                "op": "Remove Diacritics",
+                "args": []
+            },
+        ],
+    },
 ]);