diff --git a/src/catch2/catch_timer.cpp b/src/catch2/catch_timer.cpp
index 8084352e..d67d94ca 100644
--- a/src/catch2/catch_timer.cpp
+++ b/src/catch2/catch_timer.cpp
@@ -9,13 +9,13 @@
 
 #include <chrono>
 
-static const uint64_t nanosecondsInSecond = 1000000000;
-
 namespace Catch {
 
-    auto getCurrentNanosecondsSinceEpoch() -> uint64_t {
-        return std::chrono::duration_cast<std::chrono::nanoseconds>( std::chrono::high_resolution_clock::now().time_since_epoch() ).count();
-    }
+    namespace {
+        static auto getCurrentNanosecondsSinceEpoch() -> uint64_t {
+            return std::chrono::duration_cast<std::chrono::nanoseconds>(std::chrono::high_resolution_clock::now().time_since_epoch()).count();
+        }
+    } // end unnamed namespace
 
     void Timer::start() {
        m_nanoseconds = getCurrentNanosecondsSinceEpoch();
diff --git a/src/catch2/catch_timer.hpp b/src/catch2/catch_timer.hpp
index 66aab87b..30e81415 100644
--- a/src/catch2/catch_timer.hpp
+++ b/src/catch2/catch_timer.hpp
@@ -12,8 +12,6 @@
 
 namespace Catch {
 
-    auto getCurrentNanosecondsSinceEpoch() -> uint64_t;
-
     class Timer {
         uint64_t m_nanoseconds = 0;
     public: