diff --git a/wpilibj/src/main/java/edu/wpi/first/wpilibj/ADIS16448_IMU.java b/wpilibj/src/main/java/edu/wpi/first/wpilibj/ADIS16448_IMU.java
index d53f4ccc7d..2eddf64ee6 100644
--- a/wpilibj/src/main/java/edu/wpi/first/wpilibj/ADIS16448_IMU.java
+++ b/wpilibj/src/main/java/edu/wpi/first/wpilibj/ADIS16448_IMU.java
@@ -656,6 +656,10 @@ public class ADIS16448_IMU implements AutoCloseable, Sendable {
         m_spi = null;
       }
     }
+    if (m_simDevice != null) {
+      m_simDevice.close();
+      m_simDevice = null;
+    }
     System.out.println("Finished cleaning up after the IMU driver.");
   }
 
diff --git a/wpilibj/src/main/java/edu/wpi/first/wpilibj/ADIS16470_IMU.java b/wpilibj/src/main/java/edu/wpi/first/wpilibj/ADIS16470_IMU.java
index 8ca783098d..2fad3f34da 100644
--- a/wpilibj/src/main/java/edu/wpi/first/wpilibj/ADIS16470_IMU.java
+++ b/wpilibj/src/main/java/edu/wpi/first/wpilibj/ADIS16470_IMU.java
@@ -681,6 +681,10 @@ public class ADIS16470_IMU implements AutoCloseable, Sendable {
         m_spi = null;
       }
     }
+    if (m_simDevice != null) {
+      m_simDevice.close();
+      m_simDevice = null;
+    }
     System.out.println("Finished cleaning up after the IMU driver.");
   }