diff --git a/tests/helpers/test_suite.cpp b/tests/helpers/test_suite.cpp
index 272ed938..336f48b3 100644
--- a/tests/helpers/test_suite.cpp
+++ b/tests/helpers/test_suite.cpp
@@ -7,7 +7,10 @@ std::vector<std::pair<std::function<void(void)>, std::string>> &test_suite::test
     return all_tests;
 }
 
-std::string build_name(const std::string &pretty, const std::string &method);
+std::string build_name(const std::string &pretty, const std::string &method)
+{
+    return pretty.substr(0, pretty.find("::") + 2) + method;
+}
 
 test_status test_suite::go()
 {
diff --git a/tests/helpers/test_suite.hpp b/tests/helpers/test_suite.hpp
index 47ea98a2..89062c89 100644
--- a/tests/helpers/test_suite.hpp
+++ b/tests/helpers/test_suite.hpp
@@ -22,10 +22,7 @@ struct test_status
     std::vector<std::string> failures;
 };
 
-inline std::string build_name(const std::string &pretty, const std::string &method)
-{
-    return pretty.substr(0, pretty.find("::") + 2) + method;
-}
+std::string build_name(const std::string &pretty, const std::string &method);
 
 #define register_test(test) register_test_internal([this]() { test(); }, build_name(__FUNCTION__, #test));