diff --git a/proc/registers_windows_amd64.go b/proc/registers_windows_amd64.go
index 75f0b19d34b101614bb4bdaeeb0f5e7a589b3a07..edfd87c55adca327940109f7601909866ae82a36 100644
--- a/proc/registers_windows_amd64.go
+++ b/proc/registers_windows_amd64.go
@@ -124,7 +124,7 @@ func registers(thread *Thread) (Registers, error) {
 	}
 
 	var threadInfo _THREAD_BASIC_INFORMATION
-	status := _NtQueryInformationThread(syscall.Handle(thread.os.hThread), ThreadBasicInformation, uintptr(unsafe.Pointer(&threadInfo)), uint32(unsafe.Sizeof(threadInfo)), nil)
+	status := _NtQueryInformationThread(syscall.Handle(thread.os.hThread), _ThreadBasicInformation, uintptr(unsafe.Pointer(&threadInfo)), uint32(unsafe.Sizeof(threadInfo)), nil)
 	if !_NT_SUCCESS(status) {
 		return nil, fmt.Errorf("failed to get thread_basic_information")
 	}
diff --git a/proc/syscall_windows.go b/proc/syscall_windows.go
index 5fa59fe0bef20f8f873a664d462e11e7d65ccdc8..f0123f8cec7d8f3ec171680721b7d2d21e17601b 100644
--- a/proc/syscall_windows.go
+++ b/proc/syscall_windows.go
@@ -23,7 +23,7 @@ type _THREAD_BASIC_INFORMATION struct {
 }
 
 const (
-	ThreadBasicInformation = 0
+	_ThreadBasicInformation = 0
 )
 
 func _NT_SUCCESS(x _NTSTATUS) bool {