diff --git a/wpilibc/src/main/native/cpp/Timer.cpp b/wpilibc/src/main/native/cpp/Timer.cpp
index fab41297bdd..02dd9bad6ab 100644
--- a/wpilibc/src/main/native/cpp/Timer.cpp
+++ b/wpilibc/src/main/native/cpp/Timer.cpp
@@ -84,7 +84,7 @@ bool Timer::AdvanceIfElapsed(units::second_t period) {
   }
 }
 
-bool Timer::IsRunning() {
+bool Timer::IsRunning() const {
   return m_running;
 }
 
diff --git a/wpilibc/src/main/native/include/frc/Timer.h b/wpilibc/src/main/native/include/frc/Timer.h
index b416de4c6b0..37fe5e0c646 100644
--- a/wpilibc/src/main/native/include/frc/Timer.h
+++ b/wpilibc/src/main/native/include/frc/Timer.h
@@ -116,7 +116,7 @@ class Timer {
    *
    * @return true if running.
    */
-  bool IsRunning();
+  bool IsRunning() const;
 
   /**
    * Return the FPGA system clock time in seconds.