diff --git a/UsbDkHelper/UsbDkHelper.cpp b/UsbDkHelper/UsbDkHelper.cpp
index c38646c..7a68aec 100644
--- a/UsbDkHelper/UsbDkHelper.cpp
+++ b/UsbDkHelper/UsbDkHelper.cpp
@@ -39,7 +39,7 @@ typedef struct tag_REDIRECTED_DEVICE_HANDLE
     unique_ptr<UsbDkRedirectorAccess> RedirectorAccess;
 } REDIRECTED_DEVICE_HANDLE, *PREDIRECTED_DEVICE_HANDLE;
 
-void printExceptionString(const char *errorStr)
+static void printExceptionString(const char *errorStr)
 {
     auto tString = string2tstring(string(errorStr));
     OutputDebugString(tString.c_str());