diff --git a/MdePkg/Test/Mock/Include/GoogleTest/Library/MockIoLib.h b/MdePkg/Test/Mock/Include/GoogleTest/Library/MockIoLib.h
index 891dca708b..561955c20f 100644
--- a/MdePkg/Test/Mock/Include/GoogleTest/Library/MockIoLib.h
+++ b/MdePkg/Test/Mock/Include/GoogleTest/Library/MockIoLib.h
@@ -129,6 +129,15 @@ struct MockIoLib {
      IN      UINT64  Value
     )
     );
+
+  MOCK_FUNCTION_DECLARATION (
+    UINT16,
+    IoWrite16,
+    (
+     IN      UINTN   Port,
+     IN      UINT16  Value
+    )
+    );
 };
 
 #endif
diff --git a/MdePkg/Test/Mock/Library/GoogleTest/MockIoLib/MockIoLib.cpp b/MdePkg/Test/Mock/Library/GoogleTest/MockIoLib/MockIoLib.cpp
index d607eaa5d6..7bd5322c27 100644
--- a/MdePkg/Test/Mock/Library/GoogleTest/MockIoLib/MockIoLib.cpp
+++ b/MdePkg/Test/Mock/Library/GoogleTest/MockIoLib/MockIoLib.cpp
@@ -22,3 +22,4 @@ MOCK_FUNCTION_DEFINITION (MockIoLib, MmioRead32, 1, EFIAPI);
 MOCK_FUNCTION_DEFINITION (MockIoLib, MmioWrite32, 2, EFIAPI);
 MOCK_FUNCTION_DEFINITION (MockIoLib, MmioRead64, 1, EFIAPI);
 MOCK_FUNCTION_DEFINITION (MockIoLib, MmioWrite64, 2, EFIAPI);
+MOCK_FUNCTION_DEFINITION (MockIoLib, IoWrite16, 2, EFIAPI);