diff --git a/wpilibj/src/athena/java/edu/wpi/first/wpilibj/DigitalGlitchFilter.java b/wpilibj/src/athena/java/edu/wpi/first/wpilibj/DigitalGlitchFilter.java
index dc2cd0f60d..4fb388bfc8 100644
--- a/wpilibj/src/athena/java/edu/wpi/first/wpilibj/DigitalGlitchFilter.java
+++ b/wpilibj/src/athena/java/edu/wpi/first/wpilibj/DigitalGlitchFilter.java
@@ -45,6 +45,7 @@ public class DigitalGlitchFilter extends SensorBase {
       synchronized(m_mutex) {
         m_filterAllocated[m_channelIndex] = false;
       }
+      m_channelIndex = -1;
     }
   }