diff --git a/src/core/operations/PowerShellEncodeDecode.mjs b/src/core/operations/PowerShellEncodeDecode.mjs
index 58e64534..690d3cf2 100644
--- a/src/core/operations/PowerShellEncodeDecode.mjs
+++ b/src/core/operations/PowerShellEncodeDecode.mjs
@@ -5,12 +5,11 @@
  */
 
 import Operation from "../Operation.mjs";
-import OperationError from "../errors/OperationError.mjs";
 import cptable from "codepage";
 import {toBase64, fromBase64} from "../lib/Base64.mjs";
 
 // PowerShell -EncodedCommand uses UTF-16LE (code page 1200)
-const UTF16LE = 1200;
+const UTF_16LE = 1200;
 
 /**
  * PowerShell -e Encode/Decode operation
@@ -56,14 +55,11 @@ class PowerShellEncodeDecode extends Operation {
         const [mode] = args;
 
         if (mode === "Encode") {
-            const encoded = cptable.utils.encode(UTF16LE, input);
+            const encoded = cptable.utils.encode(UTF_16LE, input);
             return toBase64(new Uint8Array(encoded).buffer);
-        } else if (mode === "Decode") {
-            const bytes = fromBase64(input, "A-Za-z0-9+/=", "byteArray");
-            return cptable.utils.decode(UTF16LE, new Uint8Array(bytes));
-        } else {
-            throw new OperationError("Invalid mode");
         }
+        const bytes = fromBase64(input, "A-Za-z0-9+/=", "byteArray");
+        return cptable.utils.decode(UTF_16LE, new Uint8Array(bytes));
     }
 
 }
diff --git a/tests/operations/tests/PowerShellEncodeDecode.mjs b/tests/operations/tests/PowerShellEncodeDecode.mjs
index de2a05dd..98922b85 100644
--- a/tests/operations/tests/PowerShellEncodeDecode.mjs
+++ b/tests/operations/tests/PowerShellEncodeDecode.mjs
@@ -57,4 +57,30 @@ TestRegister.addTests([
             },
         ],
     },
+    {
+        name: "PowerShell -e Encode/Decode: round trip with non-ASCII characters",
+        input: "Write-Host \"café ☕\"",
+        expectedOutput: "Write-Host \"café ☕\"",
+        recipeConfig: [
+            {
+                op: "PowerShell -e Encode/Decode",
+                args: ["Encode"],
+            },
+            {
+                op: "PowerShell -e Encode/Decode",
+                args: ["Decode"],
+            },
+        ],
+    },
+    {
+        name: "PowerShell -e Encode/Decode: decode ignores characters outside the Base64 alphabet",
+        input: "!!!@@@###",
+        expectedOutput: "",
+        recipeConfig: [
+            {
+                op: "PowerShell -e Encode/Decode",
+                args: ["Decode"],
+            },
+        ],
+    },
 ]);