diff --git a/BaseTools/Source/C/Common/MemoryFile.c b/BaseTools/Source/C/Common/MemoryFile.c
index 7b1aa111d1..00ea0c615b 100644
--- a/BaseTools/Source/C/Common/MemoryFile.c
+++ b/BaseTools/Source/C/Common/MemoryFile.c
@@ -194,7 +194,7 @@ Returns:
     CharsToCopy = EndOfLine - InputFile->CurrentFilePointer;
   }
 
-  OutputString = malloc (CharsToCopy);
+  OutputString = malloc (CharsToCopy + 1);
   if (OutputString == NULL) {
     return NULL;
   }