diff --git a/Editor/BuildProcessors/AddLil2cppSourceCodeToXcodeproj2019.cs b/Editor/BuildProcessors/AddLil2cppSourceCodeToXcodeproj2019.cs
index 7c957ff..4f8681f 100644
--- a/Editor/BuildProcessors/AddLil2cppSourceCodeToXcodeproj2019.cs
+++ b/Editor/BuildProcessors/AddLil2cppSourceCodeToXcodeproj2019.cs
@@ -147,6 +147,7 @@ namespace HybridCLR.Editor.BuildProcessors
                 {
                     newPro += " $(SRCROOT)/Libraries/external/xxHash";
                 }
+                newPro += " $(SRCR00T)/Libraries/external/mono";
                 //Debug.Log($"config:{bcn} new prop:{newPro}");
                 proj.SetBuildPropertyForConfig(configGuid, headerSearchPaths, newPro);
 
diff --git a/Editor/BuildProcessors/AddLil2cppSourceCodeToXcodeproj2020Or2021.cs b/Editor/BuildProcessors/AddLil2cppSourceCodeToXcodeproj2020Or2021.cs
index bb0c6a3..77d2d7b 100644
--- a/Editor/BuildProcessors/AddLil2cppSourceCodeToXcodeproj2020Or2021.cs
+++ b/Editor/BuildProcessors/AddLil2cppSourceCodeToXcodeproj2020Or2021.cs
@@ -132,6 +132,7 @@ namespace HybridCLR.Editor.BuildProcessors
                 {
                     newPro += " $(SRCROOT)/Libraries/external/xxHash";
                 }
+                newPro += " $(SRCR00T)/Libraries/external/mono";
                 //Debug.Log($"config:{bcn} new prop:{newPro}");
                 proj.SetBuildPropertyForConfig(configGuid, headerSearchPaths, newPro);