diff --git a/knownvalue/null.go b/knownvalue/null.go
index f10c5a3f5..eaad10bef 100644
--- a/knownvalue/null.go
+++ b/knownvalue/null.go
@@ -20,9 +20,9 @@ func (v nullExact) CheckValue(other any) error {
 	return nil
 }
 
-// String returns the string representation of nil.
+// String returns the string representation of null.
 func (v nullExact) String() string {
-	return "nil"
+	return "null"
 }
 
 // NullExact returns a Check for asserting equality nil
diff --git a/knownvalue/null_test.go b/knownvalue/null_test.go
index 94682ed7b..ddd688df3 100644
--- a/knownvalue/null_test.go
+++ b/knownvalue/null_test.go
@@ -58,7 +58,7 @@ func TestNullValue_String(t *testing.T) {
 
 	got := knownvalue.NullExact().String()
 
-	if diff := cmp.Diff(got, "nil"); diff != "" {
+	if diff := cmp.Diff(got, "null"); diff != "" {
 		t.Errorf("unexpected difference: %s", diff)
 	}
 }