diff --git a/include/cpp-statsd-client/StatsdClient.hpp b/include/cpp-statsd-client/StatsdClient.hpp
index 1f5a978..2aa02b6 100644
--- a/include/cpp-statsd-client/StatsdClient.hpp
+++ b/include/cpp-statsd-client/StatsdClient.hpp
@@ -153,7 +153,7 @@ class StatsdClient {
 };
 
 namespace detail {
-std::string sanitizePrefix(std::string prefix) {
+inline std::string sanitizePrefix(std::string prefix) {
     // For convenience we provide the dot when generating the stat message
     if (!prefix.empty() && prefix.back() == '.') {
         prefix.pop_back();