diff --git a/staticlibs/testutils/devicetests/com/android/testutils/TestBpfMap.java b/staticlibs/testutils/devicetests/com/android/testutils/TestBpfMap.java
index 70f20d6..58e6622 100644
--- a/staticlibs/testutils/devicetests/com/android/testutils/TestBpfMap.java
+++ b/staticlibs/testutils/devicetests/com/android/testutils/TestBpfMap.java
@@ -65,10 +65,11 @@
 
     @Override
     public void insertEntry(K key, V value) throws ErrnoException,
-            IllegalArgumentException {
-        // The entry is created if and only if it doesn't exist. See BpfMap#insertEntry.
+            IllegalStateException {
+        // The entry is created if and only if it doesn't exist.
+        // And throws exception if it exists. See BpfMap#insertEntry.
         if (mMap.get(key) != null) {
-            throw new IllegalArgumentException(key + " already exist");
+            throw new IllegalStateException(key + " already exist");
         }
         mMap.put(key, value);
     }