diff --git a/src/sinol_make/commands/export/__init__.py b/src/sinol_make/commands/export/__init__.py
index 145ed1c1..af47a037 100644
--- a/src/sinol_make/commands/export/__init__.py
+++ b/src/sinol_make/commands/export/__init__.py
@@ -132,7 +132,7 @@ def run(self, args: argparse.Namespace):
 
         self.args = args
         self.task_id = package_util.get_task_id()
-        package_util.validate_files(self.task_id)
+        package_util.validate_test_names(self.task_id)
 
         with open(os.path.join(os.getcwd(), 'config.yml'), 'r') as config_file:
             config = yaml.load(config_file, Loader=yaml.FullLoader)
diff --git a/src/sinol_make/commands/gen/__init__.py b/src/sinol_make/commands/gen/__init__.py
index 665a038b..d0ca3a9c 100644
--- a/src/sinol_make/commands/gen/__init__.py
+++ b/src/sinol_make/commands/gen/__init__.py
@@ -93,7 +93,7 @@ def run(self, args: argparse.Namespace):
 
         self.args = args
         self.task_id = package_util.get_task_id()
-        package_util.validate_files(self.task_id)
+        package_util.validate_test_names(self.task_id)
         self.ingen = gen_util.get_ingen(self.task_id, args.ingen_path)
         print(util.info(f'Using ingen file {os.path.basename(self.ingen)}'))
 
diff --git a/src/sinol_make/commands/inwer/__init__.py b/src/sinol_make/commands/inwer/__init__.py
index 399147f9..41ace8f0 100644
--- a/src/sinol_make/commands/inwer/__init__.py
+++ b/src/sinol_make/commands/inwer/__init__.py
@@ -123,7 +123,7 @@ def run(self, args: argparse.Namespace):
         util.exit_if_not_package()
 
         self.task_id = package_util.get_task_id()
-        package_util.validate_files(self.task_id)
+        package_util.validate_test_names(self.task_id)
         self.inwer = inwer_util.get_inwer_path(self.task_id, args.inwer_path)
         if self.inwer is None:
             if args.inwer_path is None:
diff --git a/src/sinol_make/commands/run/__init__.py b/src/sinol_make/commands/run/__init__.py
index bed7cbb2..cac69de5 100644
--- a/src/sinol_make/commands/run/__init__.py
+++ b/src/sinol_make/commands/run/__init__.py
@@ -1105,7 +1105,7 @@ def run(self, args):
         util.exit_if_not_package()
 
         self.set_constants()
-        package_util.validate_files(self.ID)
+        package_util.validate_test_names(self.ID)
         self.args = args
         with open(os.path.join(os.getcwd(), "config.yml"), 'r') as config:
             try:
diff --git a/src/sinol_make/helpers/package_util.py b/src/sinol_make/helpers/package_util.py
index f632884c..0ee3556c 100644
--- a/src/sinol_make/helpers/package_util.py
+++ b/src/sinol_make/helpers/package_util.py
@@ -154,19 +154,14 @@ def get_memory_limit(test_path, config, lang, args=None):
     return _get_limit(LimitTypes.MEMORY_LIMIT, test_path, str_config, lang)
 
 
-def validate_files(task_id):
+def validate_test_names(task_id):
     """
     Checks if all files in the package have valid names.
     """
-    def get_invalid_files(path, *patterns):
+    def get_invalid_files(path, pattern):
         invalid_files = []
         for file in glob.glob(os.path.join(os.getcwd(), path)):
-            invalid = True
-            for pattern in patterns:
-                if pattern.match(os.path.basename(file)):
-                    invalid = False
-                    break
-            if invalid:
+            if not pattern.match(os.path.basename(file)):
                 invalid_files.append(os.path.basename(file))
         return invalid_files
 
diff --git a/tests/helpers/test_package_util.py b/tests/helpers/test_package_util.py
index e02dc5e0..4e993442 100644
--- a/tests/helpers/test_package_util.py
+++ b/tests/helpers/test_package_util.py
@@ -187,17 +187,17 @@ def test_validate_files(create_package, capsys):
     util.create_ins_outs(package_path)
     task_id = package_util.get_task_id()
     assert task_id == "abc"
-    package_util.validate_files(task_id)
+    package_util.validate_test_names(task_id)
 
     os.rename(os.path.join(package_path, "in", "abc1a.in"), os.path.join(package_path, "in", "def1a.in"))
     with pytest.raises(SystemExit):
-        package_util.validate_files(task_id)
+        package_util.validate_test_names(task_id)
     out = capsys.readouterr().out
     assert "def1a.in" in out
 
     os.rename(os.path.join(package_path, "in", "def1a.in"), os.path.join(package_path, "in", "abc1a.in"))
     os.rename(os.path.join(package_path, "out", "abc1a.out"), os.path.join(package_path, "out", "def1a.out"))
     with pytest.raises(SystemExit):
-        package_util.validate_files(task_id)
+        package_util.validate_test_names(task_id)
     out = capsys.readouterr().out
     assert "def1a.out" in out