diff --git a/src/config/sandbox_config.h b/src/config/sandbox_config.h
index 8f468aa6..2172c17e 100644
--- a/src/config/sandbox_config.h
+++ b/src/config/sandbox_config.h
@@ -39,6 +39,10 @@ class sandbox_config
 	 * @note Path must be accessible from inside of sandbox.
 	 */
 	std::string chdir = "";
+	/**
+	 * Working directory relative to the directory with the source files.
+	 */
+	std::string working_directory = "";
 	/**
 	 * Associative array of loaded limits with textual index identifying its hw group.
 	 */
diff --git a/src/helpers/config.cpp b/src/helpers/config.cpp
index b3187941..f3157e5b 100644
--- a/src/helpers/config.cpp
+++ b/src/helpers/config.cpp
@@ -125,6 +125,9 @@ std::shared_ptr<job_metadata> helpers::build_job_metadata(const YAML::Node &conf
 				if (ctask["sandbox"]["chdir"] && ctask["sandbox"]["chdir"].IsScalar()) {
 					sandbox->chdir = ctask["sandbox"]["chdir"].as<std::string>();
 				} // can be ommited... no throw
+				if (ctask["sandbox"]["working-directory"] && ctask["sandbox"]["working-directory"].IsScalar()) {
+					sandbox->working_directory = ctask["sandbox"]["working-directory"].as<std::string>();
+				} // can be ommited... no throw
 
 				// load limits... if they are supplied
 				if (ctask["sandbox"]["limits"]) {
diff --git a/src/helpers/filesystem.cpp b/src/helpers/filesystem.cpp
index a607acf6..0a1b98aa 100644
--- a/src/helpers/filesystem.cpp
+++ b/src/helpers/filesystem.cpp
@@ -58,6 +58,21 @@ fs::path helpers::normalize_path(const fs::path &path)
 	return result;
 }
 
+bool helpers::check_relative(const fs::path &path) {
+	if(path.is_absolute()) {
+		return false;
+	}
+
+	std::vector<fs::path> path_arr(path.begin(), path.end());
+	for (auto &chunk : path_arr) {
+		if (chunk.string() == "..") {
+			return false;
+		}
+	}
+
+	return true;
+}
+
 fs::path helpers::find_path_outside_sandbox(const std::string &inside_path,
 	const std::string &sandbox_chdir,
 	std::vector<std::tuple<std::string, std::string, sandbox_limits::dir_perm>> &bound_dirs,
diff --git a/src/helpers/filesystem.h b/src/helpers/filesystem.h
index 7f476a32..a2fc7d10 100644
--- a/src/helpers/filesystem.h
+++ b/src/helpers/filesystem.h
@@ -25,6 +25,13 @@ namespace helpers
 	 */
 	fs::path normalize_path(const fs::path &path);
 
+	/**
+	 * Check if given path is relative and do not contain any ".." element.
+	 * @param path path to be checked
+	 * @return true if path is relative and without double dots
+	 */
+	bool check_relative(const fs::path &path);
+
 	/**
 	 * Find path outside sandbox on real filesystem, based on given path inside sandbox.
 	 * @param inside path inside sandbox which will be resolved
diff --git a/src/job/job.cpp b/src/job/job.cpp
index 8e23096a..49a044c7 100644
--- a/src/job/job.cpp
+++ b/src/job/job.cpp
@@ -133,6 +133,11 @@ void job::build_job()
 				limits = std::make_shared<sandbox_limits>(worker_config_->get_limits());
 			}
 
+			// check relativeness of working directory
+			if (!helpers::check_relative(fs::path(sandbox->working_directory))) {
+				throw job_exception("Given working directory for task '" + task_meta->task_id + "' is not relative");
+			}
+
 			// go through variables parsing
 			sandbox->chdir = parse_job_var(sandbox->chdir);
 			sandbox->std_input = parse_job_var(sandbox->std_input);
diff --git a/src/job/job.h b/src/job/job.h
index bae00dcc..afcded87 100644
--- a/src/job/job.h
+++ b/src/job/job.h
@@ -15,6 +15,7 @@ namespace fs = boost::filesystem;
 #include "spdlog/spdlog.h"
 #include "../helpers/logger.h"
 #include "../helpers/topological_sort.h"
+#include "../helpers/filesystem.h"
 #include "../config/worker_config.h"
 #include "../config/job_metadata.h"
 #include "../config/task_metadata.h"
diff --git a/src/tasks/external_task.cpp b/src/tasks/external_task.cpp
index ac54f3b1..44b90995 100644
--- a/src/tasks/external_task.cpp
+++ b/src/tasks/external_task.cpp
@@ -13,7 +13,7 @@ namespace fs = boost::filesystem;
 external_task::external_task(const create_params &data)
 	: task_base(data.id, data.task_meta), worker_config_(data.worker_conf), sandbox_(nullptr),
 	  sandbox_config_(data.task_meta->sandbox), limits_(data.limits), logger_(data.logger), temp_dir_(data.temp_dir),
-	  source_dir_(data.source_path), working_dir_(data.working_path)
+	  evaluation_dir_(data.source_path), working_dir_(data.working_path)
 {
 	if (worker_config_ == nullptr) {
 		throw task_exception("No worker configuration provided.");
@@ -27,6 +27,14 @@ external_task::external_task(const create_params &data)
 		throw task_exception("No sandbox configuration provided.");
 	}
 
+	if (!sandbox_config_->working_directory.empty()) {
+		if (!helpers::check_relative(sandbox_config_->working_directory)) {
+			throw task_exception("Given working directory in sandbox config is not relative");
+		}
+
+		evaluation_dir_ = fs::path(data.source_path) / sandbox_config_->working_directory;
+	}
+
 	sandbox_check();
 }
 
@@ -53,9 +61,8 @@ void external_task::sandbox_init()
 {
 #ifndef _WIN32
 	if (task_meta_->sandbox->name == "isolate") {
-		auto data_dir = fs::path(source_dir_) / task_meta_->test_id;
 		sandbox_ = std::make_shared<isolate_sandbox>(
-			sandbox_config_, *limits_, worker_config_->get_worker_id(), temp_dir_, data_dir.string(), logger_);
+			sandbox_config_, *limits_, worker_config_->get_worker_id(), temp_dir_, evaluation_dir_.string(), logger_);
 	}
 #endif
 }
@@ -124,7 +131,7 @@ void external_task::results_output_init()
 fs::path external_task::find_path_outside_sandbox(std::string file)
 {
 	return helpers::find_path_outside_sandbox(
-		file, sandbox_config_->chdir, limits_->bound_dirs, (fs::path(source_dir_) / task_meta_->test_id).string());
+		file, sandbox_config_->chdir, limits_->bound_dirs, evaluation_dir_.string());
 }
 
 void external_task::get_results_output(std::shared_ptr<task_results> result)
diff --git a/src/tasks/external_task.h b/src/tasks/external_task.h
index 5ddefd31..c88c6599 100644
--- a/src/tasks/external_task.h
+++ b/src/tasks/external_task.h
@@ -96,8 +96,8 @@ class external_task : public task_base
 	std::shared_ptr<spdlog::logger> logger_;
 	/** Directory for temporary files */
 	std::string temp_dir_;
-	/** Directory where source codes for job are located */
-	fs::path source_dir_;
+	/** Directory outside sandbox where task will be executed */
+	fs::path evaluation_dir_;
 	/** Directory binded to the sandbox as default working dir */
 	fs::path working_dir_;
 	/** After execution delete stdout file produced by sandbox */
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index df8beb37..7a1ed62a 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -87,6 +87,7 @@ add_test_suite(job
 	${HELPERS_DIR}/topological_sort.cpp
 	${HELPERS_DIR}/logger.cpp
 	${HELPERS_DIR}/config.cpp
+	${HELPERS_DIR}/filesystem.cpp
 	${JOB_DIR}/job.cpp
 	job.cpp
 )
diff --git a/tests/filesystem.cpp b/tests/filesystem.cpp
index 4a1091b9..933d7113 100644
--- a/tests/filesystem.cpp
+++ b/tests/filesystem.cpp
@@ -32,6 +32,24 @@ TEST(filesystem_test, normalize)
 		helpers::normalize_path(fs::path("/first////second/../third/././.")).string());
 }
 
+TEST(filesystem_test, test_check_relative)
+{
+	ASSERT_TRUE(helpers::check_relative(fs::path("")));
+	ASSERT_TRUE(helpers::check_relative(fs::path(".")));
+	ASSERT_TRUE(helpers::check_relative(fs::path("sth")));
+	ASSERT_TRUE(helpers::check_relative(fs::path("sth/sth")));
+	ASSERT_TRUE(helpers::check_relative(fs::path("./sth")));
+	ASSERT_TRUE(helpers::check_relative(fs::path("./sth/sth")));
+	ASSERT_FALSE(helpers::check_relative(fs::path("/")));
+	ASSERT_FALSE(helpers::check_relative(fs::path("/sth")));
+	ASSERT_FALSE(helpers::check_relative(fs::path("/sth/sth")));
+	ASSERT_FALSE(helpers::check_relative(fs::path("..")));
+	ASSERT_FALSE(helpers::check_relative(fs::path("../sth")));
+	ASSERT_FALSE(helpers::check_relative(fs::path("sth/..")));
+	ASSERT_FALSE(helpers::check_relative(fs::path("sth/sth/..")));
+	ASSERT_FALSE(helpers::check_relative(fs::path("sth/sth/../sth")));
+}
+
 
 bound_dirs_type get_default_dirs()
 {
diff --git a/tests/job_config.cpp b/tests/job_config.cpp
index 24c9f889..2eb25849 100644
--- a/tests/job_config.cpp
+++ b/tests/job_config.cpp
@@ -143,6 +143,7 @@ TEST(job_config_test, correct_format)
 						   "          stdin: 01.in\n"
 						   "          stdout: 01.out\n"
 						   "          stderr: 01.err\n"
+						   "          working-directory: working\n"
 						   "          limits:\n"
 						   "              - hw-group-id: group1\n"
 						   "                time: 5\n"
@@ -198,6 +199,7 @@ TEST(job_config_test, config_data)
 						   "          stdout: 01.out\n"
 						   "          stderr: 01.err\n"
 						   "          chdir: /eval\n"
+						   "          working-directory: working\n"
 						   "          limits:\n"
 						   "              - hw-group-id: group1\n"
 						   "                time: 5\n"
@@ -253,6 +255,7 @@ TEST(job_config_test, config_data)
 	ASSERT_EQ(task2->sandbox->std_output, "01.out");
 	ASSERT_EQ(task2->sandbox->std_error, "01.err");
 	ASSERT_EQ(task2->sandbox->chdir, "/eval");
+	ASSERT_EQ(task2->sandbox->working_directory, "working");
 
 	ASSERT_EQ(task2->sandbox->loaded_limits.size(), 2u);
 	EXPECT_NO_THROW(task2->sandbox->loaded_limits.at("group1"));