diff --git a/src/core/operations/DESDecrypt.mjs b/src/core/operations/DESDecrypt.mjs
index 6725160a..92b9609f 100644
--- a/src/core/operations/DESDecrypt.mjs
+++ b/src/core/operations/DESDecrypt.mjs
@@ -73,6 +73,12 @@ class DESDecrypt extends Operation {
 DES uses a key length of 8 bytes (64 bits).
 Triple DES uses a key length of 24 bytes (192 bits).`);
         }
+        if (iv.length !== 8) {
+            throw new OperationError(`Invalid IV length: ${iv.length} bytes
+
+DES uses an IV length of 8 bytes (64 bits).
+Make sure you have specified the type correctly (e.g. Hex vs UTF8).`);
+        }
 
         input = Utils.convertToByteString(input, inputType);
 
diff --git a/src/core/operations/DESEncrypt.mjs b/src/core/operations/DESEncrypt.mjs
index 5ea5f5fc..ee845151 100644
--- a/src/core/operations/DESEncrypt.mjs
+++ b/src/core/operations/DESEncrypt.mjs
@@ -73,6 +73,12 @@ class DESEncrypt extends Operation {
 DES uses a key length of 8 bytes (64 bits).
 Triple DES uses a key length of 24 bytes (192 bits).`);
         }
+        if (iv.length !== 8) {
+            throw new OperationError(`Invalid IV length: ${iv.length} bytes
+
+DES uses an IV length of 8 bytes (64 bits).
+Make sure you have specified the type correctly (e.g. Hex vs UTF8).`);
+        }
 
         input = Utils.convertToByteString(input, inputType);
 
diff --git a/src/core/operations/TripleDESDecrypt.mjs b/src/core/operations/TripleDESDecrypt.mjs
index 90a83220..f1aa02c8 100644
--- a/src/core/operations/TripleDESDecrypt.mjs
+++ b/src/core/operations/TripleDESDecrypt.mjs
@@ -75,6 +75,12 @@ class TripleDESDecrypt extends Operation {
 Triple DES uses a key length of 24 bytes (192 bits).
 DES uses a key length of 8 bytes (64 bits).`);
         }
+        if (iv.length !== 8) {
+            throw new OperationError(`Invalid IV length: ${iv.length} bytes
+
+Triple DES uses an IV length of 8 bytes (64 bits).
+Make sure you have specified the type correctly (e.g. Hex vs UTF8).`);
+        }
 
         input = Utils.convertToByteString(input, inputType);
 
diff --git a/src/core/operations/TripleDESEncrypt.mjs b/src/core/operations/TripleDESEncrypt.mjs
index d4475f83..9f767ab9 100644
--- a/src/core/operations/TripleDESEncrypt.mjs
+++ b/src/core/operations/TripleDESEncrypt.mjs
@@ -75,6 +75,12 @@ class TripleDESEncrypt extends Operation {
 Triple DES uses a key length of 24 bytes (192 bits).
 DES uses a key length of 8 bytes (64 bits).`);
         }
+        if (iv.length !== 8) {
+            throw new OperationError(`Invalid IV length: ${iv.length} bytes
+
+Triple DES uses an IV length of 8 bytes (64 bits).
+Make sure you have specified the type correctly (e.g. Hex vs UTF8).`);
+        }
 
         input = Utils.convertToByteString(input, inputType);
 
diff --git a/tests/node/tests/operations.mjs b/tests/node/tests/operations.mjs
index 81af9593..cfe67211 100644
--- a/tests/node/tests/operations.mjs
+++ b/tests/node/tests/operations.mjs
@@ -400,7 +400,7 @@ color: white;
             },
             iv: {
                 string: "threetwo",
-                option: "Hex",
+                option: "utf8",
             },
             mode: "ECB",
         });
@@ -415,7 +415,7 @@ color: white;
             },
             iv: {
                 string: "threetwo",
-                option: "Hex",
+                option: "utf8",
             },
             mode: "ECB",
         });
@@ -943,10 +943,10 @@ smothering ampersand abreast
             chef.tripleDESDecrypt(
                 chef.tripleDESEncrypt("Destroy Money", {
                     key: {string: "30 31 2f 30 34 2f 31 39 39 39 20 32 32 3a 33 33 3a 30 3130 31 2f 30 34", option: "Hex"},
-                    iv: {string: "00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0000 00 00 00 00", option: "Hex"}}),
+                    iv: {string: "00 00 00 00 00 00 00 00", option: "Hex"}}),
                 {
                     key: {string: "30 31 2f 30 34 2f 31 39 39 39 20 32 32 3a 33 33 3a 30 3130 31 2f 30 34", option: "Hex"},
-                    iv: {string: "00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0000 00 00 00 00", option: "Hex"}
+                    iv: {string: "00 00 00 00 00 00 00 00", option: "Hex"}
                 }).toString(),
             "Destroy Money");
     }),