diff --git a/Library/OcCompressionLib/OcCompressionLib.inf b/Library/OcCompressionLib/OcCompressionLib.inf
index 65c865b6..beb8340a 100644
--- a/Library/OcCompressionLib/OcCompressionLib.inf
+++ b/Library/OcCompressionLib/OcCompressionLib.inf
@@ -73,4 +73,4 @@
 [BuildOptions]
   CLANGPDB:*_*_*_CC_FLAGS = -Wno-deprecated-non-prototype
   CLANGGCC:*_*_*_CC_FLAGS = -Wno-deprecated-non-prototype
-  XCODE:*_*_*_CC_FLAGS    = -Wno-deprecated-non-prototype
+  XCODE:*_*_*_CC_FLAGS    = -Wno-deprecated-non-prototype -Wno-unknown-warning-option