diff --git a/InOsEmuPkg/Unix/Sec/PosixFileSystem.c b/InOsEmuPkg/Unix/Sec/PosixFileSystem.c
index d2d3e6da0e..855825627f 100644
--- a/InOsEmuPkg/Unix/Sec/PosixFileSystem.c
+++ b/InOsEmuPkg/Unix/Sec/PosixFileSystem.c
@@ -1493,7 +1493,7 @@ PosixFileSystmeThunkOpen (
   Private->FilePath[i] = 0;
 
 
-  Private->VolumeLabel = malloc (StrLen (L"EFI_EMULATED"));
+  Private->VolumeLabel = malloc (StrSize (L"EFI_EMULATED"));
   if (Private->VolumeLabel == NULL) {
     free (Private->FilePath);
     free (Private);