diff --git a/pkg/ottl/e2e/e2e_test.go b/pkg/ottl/e2e/e2e_test.go
index 2f31e6c434fa..6384dd185bbf 100644
--- a/pkg/ottl/e2e/e2e_test.go
+++ b/pkg/ottl/e2e/e2e_test.go
@@ -335,6 +335,12 @@ func Test_e2e_converters(t *testing.T) {
 				tCtx.GetLogRecord().Attributes().PutStr("SOMETHING", "myvalue")
 			},
 		},
+		{
+			statement: `set(attributes[ConvertCase(attributes[attributes["flags"]], "upper")], "myvalue")`,
+			want: func(tCtx ottllog.TransformContext) {
+				tCtx.GetLogRecord().Attributes().PutStr("SOMETHING", "myvalue")
+			},
+		},
 		{
 			statement: `set(attributes[attributes["flags"]], "something33")`,
 			want: func(tCtx ottllog.TransformContext) {