diff --git a/src/sinol_make/contest_types/__init__.py b/src/sinol_make/contest_types/__init__.py
index 98887606..d1815492 100644
--- a/src/sinol_make/contest_types/__init__.py
+++ b/src/sinol_make/contest_types/__init__.py
@@ -1,6 +1,7 @@
 from sinol_make.contest_types.default import DefaultContest
 from sinol_make.contest_types.icpc import ICPCContest
 from sinol_make.contest_types.oi import OIContest
+from sinol_make.contest_types.oij import OIJContest
 from sinol_make.helpers.package_util import get_config
 from sinol_make.interfaces.Errors import UnknownContestType
 
@@ -15,5 +16,7 @@ def get_contest_type():
         return OIContest()
     elif contest_type == "icpc":
         return ICPCContest()
+    elif contest_type == "oij":
+        return OIJContest()
     else:
         raise UnknownContestType(f'Unknown contest type "{contest_type}"')
diff --git a/src/sinol_make/contest_types/oij.py b/src/sinol_make/contest_types/oij.py
new file mode 100644
index 00000000..3536b93b
--- /dev/null
+++ b/src/sinol_make/contest_types/oij.py
@@ -0,0 +1,32 @@
+import argparse
+
+from sinol_make import util
+from sinol_make.helpers import package_util
+from sinol_make.contest_types.default import DefaultContest
+
+
+class OIJContest(DefaultContest):
+    """
+    Contest type for Polish Junior Olympiad in Informatics.
+    """
+
+    def get_type(self) -> str:
+        return "oij"
+
+    def argument_overrides(self, args: argparse.Namespace) -> argparse.Namespace:
+        """
+        Add arguments for features required by OIJ contest
+        """
+        args.export_ocen = True
+        return args
+
+    def verify_pre_gen(self):
+        """
+        Verify if scores sum up to 100.
+        """
+        config = package_util.get_config()
+        if 'scores' not in config:
+            util.exit_with_error("Scores are not defined in config.yml.")
+        total_score = sum(config['scores'].values())
+        if total_score != 100:
+            util.exit_with_error(f"Total score in config is {total_score}, but should be 100.")