diff --git a/MdePkg/Library/BasePrintLib/PrintLib.c b/MdePkg/Library/BasePrintLib/PrintLib.c
index 145ca3494a..548ec5490f 100644
--- a/MdePkg/Library/BasePrintLib/PrintLib.c
+++ b/MdePkg/Library/BasePrintLib/PrintLib.c
@@ -355,6 +355,12 @@ BasePrintLibVSPrint (
           Flags &= (~ARGUMENT_UNICODE);
           ArgumentString = "<null string>";
         }
+        //
+        // Set the default precision for string to be zero if not specified.
+        //
+        if ((Flags & PRECISION) == 0) {
+          Precision = 0;
+        }
         break;
 
       case 'c':