diff --git a/wpilibc/src/main/native/cpp/frc2/Timer.cpp b/wpilibc/src/main/native/cpp/frc2/Timer.cpp
index b9664237df..b54dc485c7 100644
--- a/wpilibc/src/main/native/cpp/frc2/Timer.cpp
+++ b/wpilibc/src/main/native/cpp/frc2/Timer.cpp
@@ -116,7 +116,7 @@ void Timer::Stop() {
   }
 }
 
-bool Timer::HasElapsed(units::second_t period) { return Get() > period; }
+bool Timer::HasElapsed(units::second_t period) const { return Get() > period; }
 
 bool Timer::HasPeriodPassed(units::second_t period) {
   return AdvanceIfElapsed(period);
diff --git a/wpilibc/src/main/native/include/frc2/Timer.h b/wpilibc/src/main/native/include/frc2/Timer.h
index a6a04b1a9f..82668ba42f 100644
--- a/wpilibc/src/main/native/include/frc2/Timer.h
+++ b/wpilibc/src/main/native/include/frc2/Timer.h
@@ -94,7 +94,7 @@ class Timer {
    * @param seconds The period to check.
    * @return        True if the period has passed.
    */
-  bool HasElapsed(units::second_t period);
+  bool HasElapsed(units::second_t period) const;
 
   /**
    * Check if the period specified has passed and if it has, advance the start