diff --git a/src/BinaryKits.Zpl.Label.UnitTest/BarcodeTest.cs b/src/BinaryKits.Zpl.Label.UnitTest/BarcodeTest.cs
index fc9ec80a..ff080acd 100644
--- a/src/BinaryKits.Zpl.Label.UnitTest/BarcodeTest.cs
+++ b/src/BinaryKits.Zpl.Label.UnitTest/BarcodeTest.cs
@@ -21,7 +21,7 @@ public void Barcode39()
 
             Debug.WriteLine(output);
             Assert.IsNotNull(output);
-            Assert.AreEqual("^XA\n^LH0,0\n^CI28\n\n^FO100,100\n^BY2\n^B3N,N,100,Y,N\n^FD123ABC^FS\n^XZ", output);
+            Assert.AreEqual("^XA\n^LH0,0\n^CI28\n\n^FO100,100\n^BY2,3\n^B3N,N,100,Y,N\n^FD123ABC^FS\n^XZ", output);
         }
 
         [TestMethod]
@@ -37,7 +37,7 @@ public void Barcode128()
 
             Debug.WriteLine(output);
             Assert.IsNotNull(output);
-            Assert.AreEqual("^XA\n^LH0,0\n^CI28\n\n^FO100,300\n^BY2\n^BCN,100,Y,N\n^FD123ABC^FS\n^XZ", output);
+            Assert.AreEqual("^XA\n^LH0,0\n^CI28\n\n^FO100,300\n^BY2,3\n^BCN,100,Y,N\n^FD123ABC^FS\n^XZ", output);
         }
 
         [TestMethod]
@@ -53,7 +53,7 @@ public void BarcodeEan13()
 
             Debug.WriteLine(output);
             Assert.IsNotNull(output);
-            Assert.AreEqual("^XA\n^LH0,0\n^CI28\n\n^FO100,300\n^BY2\n^BEN,100,Y,N\n^FD123456^FS\n^XZ", output);
+            Assert.AreEqual("^XA\n^LH0,0\n^CI28\n\n^FO100,300\n^BY2,3\n^BEN,100,Y,N\n^FD123456^FS\n^XZ", output);
         }
     }
 }
diff --git a/src/BinaryKits.Zpl.Label/Elements/ZplBarcode.cs b/src/BinaryKits.Zpl.Label/Elements/ZplBarcode.cs
index e78138de..6600f706 100644
--- a/src/BinaryKits.Zpl.Label/Elements/ZplBarcode.cs
+++ b/src/BinaryKits.Zpl.Label/Elements/ZplBarcode.cs
@@ -55,7 +55,7 @@ protected string RenderFieldOrientation()
 
         protected string RenderModuleWidth()
         {
-            return $"^BY{ModuleWidth}";
+            return $"^BY{ModuleWidth},{WideBarToNarrowBarWidthRatio}";
         }
 
         protected bool IsDigitsOnly(string text)