diff --git a/O365.Security.Native.ETW.Debug.nuspec b/O365.Security.Native.ETW.Debug.nuspec
index 85bfe45..34c590e 100644
--- a/O365.Security.Native.ETW.Debug.nuspec
+++ b/O365.Security.Native.ETW.Debug.nuspec
@@ -2,7 +2,7 @@
 <package xmlns="http://schemas.microsoft.com/packaging/2011/08/nuspec.xsd">
     <metadata>
         <id>Microsoft.O365.Security.Native.ETW.Debug</id>
-        <version>4.1.8</version>
+        <version>4.1.9</version>
         <title>Microsoft.O365.Security.Native.ETW Debug - managed wrappers for krabsetw</title>
         <authors>Microsoft</authors>
         <owners>Microsoft</owners>
diff --git a/O365.Security.Native.ETW.nuspec b/O365.Security.Native.ETW.nuspec
index 2347a01..474d78c 100644
--- a/O365.Security.Native.ETW.nuspec
+++ b/O365.Security.Native.ETW.nuspec
@@ -2,7 +2,7 @@
 <package xmlns="http://schemas.microsoft.com/packaging/2011/08/nuspec.xsd">
     <metadata>
         <id>Microsoft.O365.Security.Native.ETW</id>
-        <version>4.1.8</version>
+        <version>4.1.9</version>
         <title>Microsoft.O365.Security.Native.ETW - managed wrappers for krabsetw</title>
         <authors>Microsoft</authors>
         <owners>Microsoft</owners>
diff --git a/krabs/krabs/perfinfo_groupmask.hpp b/krabs/krabs/perfinfo_groupmask.hpp
index 9d322d4..8d36894 100644
--- a/krabs/krabs/perfinfo_groupmask.hpp
+++ b/krabs/krabs/perfinfo_groupmask.hpp
@@ -184,8 +184,9 @@ typedef struct _EVENT_TRACE_GROUPMASK_INFORMATION {
     PERFINFO_GROUPMASK EventTraceGroupMasks;
 } EVENT_TRACE_GROUPMASK_INFORMATION, * PEVENT_TRACE_GROUPMASK_INFORMATION;
 
+#ifndef _WINTERNL_
+
 typedef enum _SYSTEM_INFORMATION_CLASS {
-    SystemPerformanceTraceInformation = 0x1f
 } SYSTEM_INFORMATION_CLASS;
 
 typedef LONG NTSTATUS;
@@ -197,8 +198,12 @@ extern "C" NTSTATUS NTAPI NtQuerySystemInformation(
     _Out_opt_ PULONG ReturnLength
 );
 
+#endif // _WINTERNL_
+
 extern "C" NTSTATUS NTAPI NtSetSystemInformation(
     _In_ SYSTEM_INFORMATION_CLASS SystemInformationClass,
     _In_reads_bytes_opt_(SystemInformationLength) PVOID SystemInformation,
     _In_ ULONG SystemInformationLength
-);
\ No newline at end of file
+);
+
+constexpr auto SystemPerformanceTraceInformation{ static_cast<SYSTEM_INFORMATION_CLASS>(0x1f) };
diff --git a/krabsetw.nuspec b/krabsetw.nuspec
index 6bd0d01..039ee21 100644
--- a/krabsetw.nuspec
+++ b/krabsetw.nuspec
@@ -2,7 +2,7 @@
 <package xmlns="http://schemas.microsoft.com/packaging/2011/08/nuspec.xsd">
     <metadata>
         <id>Microsoft.O365.Security.Krabsetw</id>
-        <version>4.1.8</version>
+        <version>4.1.9</version>
         <title>Krabs ETW Wrappers</title>
         <authors>Microsoft</authors>
         <owners>Microsoft</owners>