diff --git a/ShellPkg/Application/Shell/ShellProtocol.c b/ShellPkg/Application/Shell/ShellProtocol.c
index 249e1e19d8..6a248522b5 100644
--- a/ShellPkg/Application/Shell/ShellProtocol.c
+++ b/ShellPkg/Application/Shell/ShellProtocol.c
@@ -2220,7 +2220,7 @@ ShellSearchHandle(
 
   CurrentFilePattern = AllocateZeroPool((NextFilePatternStart-FilePattern+1)*sizeof(CHAR16));
   ASSERT(CurrentFilePattern != NULL);
-  StrCpyS(CurrentFilePattern, NextFilePatternStart-FilePattern+1, FilePattern);
+  StrnCpyS(CurrentFilePattern, NextFilePatternStart-FilePattern+1, FilePattern, NextFilePatternStart-FilePattern);
 
   if (CurrentFilePattern[0]   == CHAR_NULL
     &&NextFilePatternStart[0] == CHAR_NULL