diff --git a/ShellPkg/Library/UefiShellDebug1CommandsLib/Compress.c b/ShellPkg/Library/UefiShellDebug1CommandsLib/Compress.c
index 736d2a35b3..cde2c54f1b 100644
--- a/ShellPkg/Library/UefiShellDebug1CommandsLib/Compress.c
+++ b/ShellPkg/Library/UefiShellDebug1CommandsLib/Compress.c
@@ -23,6 +23,8 @@
 #include <Library/DebugLib.h>
 #include <Library/ShellLib.h>
 
+#include "Compress.h"
+
 //
 // Macro Definitions
 //
@@ -1307,20 +1309,20 @@ Encode (
   The compression routine.
 
   @param[in]       SrcBuffer     The buffer containing the source data.
-  @param[in]       SrcSize       The number of bytes in SrcBuffer.
+  @param[in]       SrcSize       Number of bytes in SrcBuffer.
   @param[in]       DstBuffer     The buffer to put the compressed image in.
   @param[in, out]  DstSize       On input the size (in bytes) of DstBuffer, on
-                                return the number of bytes placed in DstBuffer.
+                                 return the number of bytes placed in DstBuffer.
 
   @retval EFI_SUCCESS           The compression was sucessful.
   @retval EFI_BUFFER_TOO_SMALL  The buffer was too small.  DstSize is required.
 **/
 EFI_STATUS
 Compress (
-  IN       VOID   *SrcBuffer,
-  IN       UINT64 SrcSize,
-  IN       VOID   *DstBuffer,
-  IN OUT   UINT64 *DstSize
+  IN      VOID    *SrcBuffer,
+  IN      UINT64  SrcSize,
+  IN      VOID    *DstBuffer,
+  IN OUT  UINT64  *DstSize
   )
 {
   EFI_STATUS  Status;
diff --git a/ShellPkg/Library/UefiShellDebug1CommandsLib/Compress.h b/ShellPkg/Library/UefiShellDebug1CommandsLib/Compress.h
index 39a997178f..7fe844e212 100644
--- a/ShellPkg/Library/UefiShellDebug1CommandsLib/Compress.h
+++ b/ShellPkg/Library/UefiShellDebug1CommandsLib/Compress.h
@@ -28,7 +28,6 @@
   @retval EFI_BUFFER_TOO_SMALL  The buffer was too small.  DstSize is required.
 **/
 EFI_STATUS
-EFIAPI
 Compress (
   IN      VOID    *SrcBuffer,
   IN      UINT64  SrcSize,