diff --git a/userspace/libsinsp/test/CMakeLists.txt b/userspace/libsinsp/test/CMakeLists.txt
index 8dd0138fdc..3ea523ffa8 100644
--- a/userspace/libsinsp/test/CMakeLists.txt
+++ b/userspace/libsinsp/test/CMakeLists.txt
@@ -106,6 +106,7 @@ set(LIBSINSP_UNIT_TESTS_SOURCES
 	filter_escaping.ut.cpp
 	filter_parser.ut.cpp
 	filter_op_bcontains.ut.cpp
+	filter_op_contains.ut.cpp
 	filter_op_pmatch.ut.cpp
 	filter_op_numeric_compare.ut.cpp
 	filter_compiler.ut.cpp
diff --git a/userspace/libsinsp/test/filter_op_contains.ut.cpp b/userspace/libsinsp/test/filter_op_contains.ut.cpp
new file mode 100644
index 0000000000..393db2fb35
--- /dev/null
+++ b/userspace/libsinsp/test/filter_op_contains.ut.cpp
@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: Apache-2.0
+/*
+Copyright (C) 2024 The Falco Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+*/
+
+#include <libsinsp/sinsp.h>
+#include <gtest/gtest.h>
+
+#include <sinsp_with_test_input.h>
+
+TEST_F(sinsp_with_test_input, contains_icontains)
+{
+	add_default_init_thread();
+
+	open_inspector();
+
+	int64_t fd = 1;
+	sinsp_evt * evt = add_event_advance_ts(increasing_ts(), 3, PPME_SYSCALL_OPEN_X, 6, fd, "/opt/dir/SUBDIR/file.txt", PPM_O_RDWR | PPM_O_CREAT, 0, 0, (uint64_t) 0);
+
+	EXPECT_TRUE(eval_filter(evt, "evt.arg.flags contains O_CREAT"));
+	EXPECT_FALSE(eval_filter(evt, "evt.arg.flags contains O_TMPFILE"));
+	EXPECT_TRUE(eval_filter(evt, "evt.arg.flags icontains O_CREAT"));
+	EXPECT_TRUE(eval_filter(evt, "fd.name contains /dir"));
+	EXPECT_TRUE(eval_filter(evt, "fd.name icontains /subdir"));
+	EXPECT_FALSE(eval_filter(evt, "fd.name icontains notthis"));
+}