diff --git a/judgels-backends/judgels-grader-engines/src/main/java/judgels/gabriel/aggregators/SumAggregator.java b/judgels-backends/judgels-grader-engines/src/main/java/judgels/gabriel/aggregators/SumAggregator.java
index 5163a4723..9cb4ef0e7 100644
--- a/judgels-backends/judgels-grader-engines/src/main/java/judgels/gabriel/aggregators/SumAggregator.java
+++ b/judgels-backends/judgels-grader-engines/src/main/java/judgels/gabriel/aggregators/SumAggregator.java
@@ -33,7 +33,11 @@ public AggregationResult aggregate(List<TestCaseVerdict> testCaseVerdicts, doubl
             if (verdict == Verdict.ACCEPTED) {
                 points = testCaseFullPoints;
             } else if (verdict == Verdict.OK) {
-                points = testCaseVerdict.getPoints().orElse(0.0);
+                if (testCaseVerdict.getPoints().isPresent()) {
+                    points = testCaseVerdict.getPoints().get();
+                } else if (testCaseVerdict.getPercentage().isPresent()) {
+                    points = testCaseVerdict.getPercentage().get() * testCaseFullPoints / 100.0;
+                }
             }
             aggregatedPoints += points;
 
diff --git a/judgels-backends/judgels-grader-engines/src/test/java/judgels/gabriel/aggregators/SumAggregatorTests.java b/judgels-backends/judgels-grader-engines/src/test/java/judgels/gabriel/aggregators/SumAggregatorTests.java
index 0b3c92a22..d3ef833e6 100644
--- a/judgels-backends/judgels-grader-engines/src/test/java/judgels/gabriel/aggregators/SumAggregatorTests.java
+++ b/judgels-backends/judgels-grader-engines/src/test/java/judgels/gabriel/aggregators/SumAggregatorTests.java
@@ -43,6 +43,19 @@ void aggregate_partial_points() {
         assertThat(result.getTestCasePoints()).containsExactly("25", "0", "30", "0");
     }
 
+    @Test
+    void aggregate_partial_percentage() {
+        List<TestCaseVerdict> testCaseVerdicts = ImmutableList.of(
+                new TestCaseVerdict.Builder().verdict(Verdict.ACCEPTED).build(),
+                new TestCaseVerdict.Builder().verdict(Verdict.TIME_LIMIT_EXCEEDED).build(),
+                new TestCaseVerdict.Builder().verdict(Verdict.OK).percentage(50.0).build(),
+                new TestCaseVerdict.Builder().verdict(Verdict.WRONG_ANSWER).build());
+
+        AggregationResult result = aggregator.aggregate(testCaseVerdicts, 100.0);
+        assertThat(result.getSubtaskVerdict()).isEqualTo(SubtaskVerdict.of(Verdict.TIME_LIMIT_EXCEEDED, 37.5));
+        assertThat(result.getTestCasePoints()).containsExactly("25", "0", "12.5", "0");
+    }
+
     @Test
     void aggregate_partial_points_with_skipped() {
         List<TestCaseVerdict> testCaseVerdicts = ImmutableList.of(