diff --git a/wpilibj/src/main/java/edu/wpi/first/wpilibj/counter/Tachometer.java b/wpilibj/src/main/java/edu/wpi/first/wpilibj/counter/Tachometer.java
index f83b255c05..90ae734626 100644
--- a/wpilibj/src/main/java/edu/wpi/first/wpilibj/counter/Tachometer.java
+++ b/wpilibj/src/main/java/edu/wpi/first/wpilibj/counter/Tachometer.java
@@ -77,7 +77,7 @@ public class Tachometer implements Sendable, AutoCloseable {
     if (period == 0) {
       return 0;
     }
-    return period;
+    return 1 / period;
   }
 
   /**