diff --git a/src/main/kotlin/info/mking/k2zpl/builder/Extensions.kt b/src/main/kotlin/info/mking/k2zpl/builder/Extensions.kt
index 7d32006..6af63df 100644
--- a/src/main/kotlin/info/mking/k2zpl/builder/Extensions.kt
+++ b/src/main/kotlin/info/mking/k2zpl/builder/Extensions.kt
@@ -4,7 +4,6 @@ package info.mking.k2zpl.builder
 
 import info.mking.k2zpl.command.EndFormat
 import info.mking.k2zpl.command.FieldData
-import info.mking.k2zpl.command.FieldSeparator
 import info.mking.k2zpl.command.LabelLength
 import info.mking.k2zpl.command.PrintQuantity
 import info.mking.k2zpl.command.StartFormat
@@ -12,13 +11,6 @@ import info.mking.k2zpl.command.ZplCommand
 import info.mking.k2zpl.command.options.ZplFont
 import info.mking.k2zpl.command.options.ZplYesNo
 
-/**
- * Adds a field separator.
- */
-fun ZplBuilder.fieldSeparator() {
-    command(FieldSeparator)
-}
-
 /**
  * Adds field data.
  * @param data The data to be added to the field.
diff --git a/src/main/kotlin/info/mking/k2zpl/builder/ZplBuilder.kt b/src/main/kotlin/info/mking/k2zpl/builder/ZplBuilder.kt
index ccfb572..9925178 100644
--- a/src/main/kotlin/info/mking/k2zpl/builder/ZplBuilder.kt
+++ b/src/main/kotlin/info/mking/k2zpl/builder/ZplBuilder.kt
@@ -6,6 +6,7 @@ import info.mking.k2zpl.command.CustomCommand
 import info.mking.k2zpl.command.Font
 import info.mking.k2zpl.command.ZplCommand
 import info.mking.k2zpl.command.fieldOrigin
+import info.mking.k2zpl.command.fieldSeparator
 import info.mking.k2zpl.command.font
 import info.mking.k2zpl.command.options.ZplDpiSetting
 import info.mking.k2zpl.command.options.ZplFieldOrientation
diff --git a/src/main/kotlin/info/mking/k2zpl/command/BarCode.kt b/src/main/kotlin/info/mking/k2zpl/command/BarCode.kt
index 5538095..baea248 100644
--- a/src/main/kotlin/info/mking/k2zpl/command/BarCode.kt
+++ b/src/main/kotlin/info/mking/k2zpl/command/BarCode.kt
@@ -3,7 +3,6 @@ package info.mking.k2zpl.command
 import info.mking.k2zpl.builder.ZplBuilder
 import info.mking.k2zpl.builder.command
 import info.mking.k2zpl.builder.fieldData
-import info.mking.k2zpl.builder.fieldSeparator
 import info.mking.k2zpl.builder.toZplYesNo
 import info.mking.k2zpl.command.options.ZplBarcodeType
 import info.mking.k2zpl.command.options.ZplFieldOrientation
diff --git a/src/main/kotlin/info/mking/k2zpl/command/FieldSeparator.kt b/src/main/kotlin/info/mking/k2zpl/command/FieldSeparator.kt
index 484d998..4c6171d 100644
--- a/src/main/kotlin/info/mking/k2zpl/command/FieldSeparator.kt
+++ b/src/main/kotlin/info/mking/k2zpl/command/FieldSeparator.kt
@@ -1,5 +1,15 @@
 package info.mking.k2zpl.command
 
+import info.mking.k2zpl.builder.ZplBuilder
+import info.mking.k2zpl.builder.command
+
 internal data object FieldSeparator : ZplCommand {
     override val command: CharSequence = "^FS"
+}
+
+/**
+ * Adds a field separator.
+ */
+fun ZplBuilder.fieldSeparator() {
+    command(FieldSeparator)
 }
\ No newline at end of file
diff --git a/src/test/kotlin/info/mking/k2zpl/command/FieldSeparatorTest.kt b/src/test/kotlin/info/mking/k2zpl/command/FieldSeparatorTest.kt
new file mode 100644
index 0000000..d28ecb9
--- /dev/null
+++ b/src/test/kotlin/info/mking/k2zpl/command/FieldSeparatorTest.kt
@@ -0,0 +1,25 @@
+package info.mking.k2zpl.command
+
+import info.mking.k2zpl.k2zpl
+import info.mking.k2zpl.testBuildString
+import io.kotest.core.spec.IsolationMode
+import io.kotest.core.spec.style.DescribeSpec
+import io.kotest.matchers.shouldBe
+
+class FieldSeparatorTest : DescribeSpec({
+    isolationMode = IsolationMode.InstancePerLeaf
+
+    describe("FieldSeparator") {
+        it("outputs correct command") {
+            FieldSeparator.testBuildString() shouldBe "^FS"
+        }
+    }
+    describe("fieldSeparator extension function") {
+        it("outputs correct command") {
+            val result = k2zpl {
+                fieldSeparator()
+            }
+            result shouldBe "^FS\n"
+        }
+    }
+})
\ No newline at end of file