diff --git a/linux/boardtest/UartTestClass.cpp b/linux/boardtest/UartTestClass.cpp
index 88a0895c..2e1a195c 100644
--- a/linux/boardtest/UartTestClass.cpp
+++ b/linux/boardtest/UartTestClass.cpp
@@ -373,7 +373,7 @@ void UartTestClass::handleFoundDlePacket(uint8_t* packet, size_t len) {
   sif::info << "Detected DLE encoded packet with decoded size " << len << std::endl;
 }
 
-std::string gen_random(const int len) {
+std::string UartTestClass::gen_random(const int len) {
     static const char alphanum[] =
         "0123456789"
         "ABCDEFGHIJKLMNOPQRSTUVWXYZ"