diff --git a/BaseTools/Source/Python/Ecc/EccToolError.py b/BaseTools/Source/Python/Ecc/EccToolError.py
index d97bf7948c..2ff36c8329 100644
--- a/BaseTools/Source/Python/Ecc/EccToolError.py
+++ b/BaseTools/Source/Python/Ecc/EccToolError.py
@@ -186,7 +186,7 @@ gEccErrorMessage = {
     ERROR_META_DATA_FILE_CHECK_BINARY_INF_IN_FDF : "An INF file is specified in the FDF file, but not in the DSC file, therefore the INF file must be for a Binary module only",
     ERROR_META_DATA_FILE_CHECK_PCD_DUPLICATE : "Duplicate PCDs found",
     ERROR_META_DATA_FILE_CHECK_PCD_FLASH : "PCD settings in the FDF file should only be related to flash",
-    ERROR_META_DATA_FILE_CHECK_PCD_NO_USE : "There should be no PCDs declared in INF files that are not specified in in either a DSC or FDF file",
+    ERROR_META_DATA_FILE_CHECK_PCD_NO_USE : "There should be no PCDs declared in INF files that are not specified in either a DSC or FDF file",
     ERROR_META_DATA_FILE_CHECK_DUPLICATE_GUID : "Duplicate GUID found",
     ERROR_META_DATA_FILE_CHECK_DUPLICATE_PROTOCOL : "Duplicate PROTOCOL found",
     ERROR_META_DATA_FILE_CHECK_DUPLICATE_PPI : "Duplicate PPI found",
diff --git a/BaseTools/Source/Python/build/build.py b/BaseTools/Source/Python/build/build.py
index 07187c0361..51fb1f433e 100755
--- a/BaseTools/Source/Python/build/build.py
+++ b/BaseTools/Source/Python/build/build.py
@@ -205,7 +205,7 @@ class MakeSubProc(Popen):
 #
 # This method will call subprocess.Popen to execute an external program with
 # given options in specified directory. Because of the dead-lock issue during
-# redirecting output of the external program, threads are used to to do the
+# redirecting output of the external program, threads are used to do the
 # redirection work.
 #
 # @param  Command               A list or string containing the call of the program