diff --git a/BaseTools/Source/Python/build/build.py b/BaseTools/Source/Python/build/build.py
index 8c3315619a..d6006b651f 100644
--- a/BaseTools/Source/Python/build/build.py
+++ b/BaseTools/Source/Python/build/build.py
@@ -1499,7 +1499,7 @@ class Build():
         if self.Fdf:
             # First get the XIP base address for FV map file.
             GuidPattern = re.compile("[-a-fA-F0-9]+")
-            GuidName = re.compile("\(GUID=[-a-fA-F0-9]+")
+            GuidName = re.compile(r"\(GUID=[-a-fA-F0-9]+")
             for FvName in Wa.FdfProfile.FvDict:
                 FvMapBuffer = os.path.join(Wa.FvDir, FvName + '.Fv.map')
                 if not os.path.exists(FvMapBuffer):