diff --git a/paimon-flink/paimon-flink-common/src/main/java/org/apache/paimon/flink/lookup/StaticPartitionLoader.java b/paimon-flink/paimon-flink-common/src/main/java/org/apache/paimon/flink/lookup/StaticPartitionLoader.java
index bdfecc39f902..1a7eb32abec9 100644
--- a/paimon-flink/paimon-flink-common/src/main/java/org/apache/paimon/flink/lookup/StaticPartitionLoader.java
+++ b/paimon-flink/paimon-flink-common/src/main/java/org/apache/paimon/flink/lookup/StaticPartitionLoader.java
@@ -26,6 +26,7 @@
 import org.apache.paimon.utils.InternalRowPartitionComputer;
 
 import java.util.ArrayList;
+import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
 
@@ -48,9 +49,12 @@ public void open() {
         String defaultPartitionName = Options.fromMap(table.options()).get(PARTITION_DEFAULT_NAME);
         InternalRowSerializer serializer = new InternalRowSerializer(partitionType);
         for (Map<String, String> spec : scanPartitions) {
+            Map<String, String> completedSpec = new LinkedHashMap<>(spec);
+            table.partitionKeys()
+                    .forEach(key -> completedSpec.putIfAbsent(key, defaultPartitionName));
             GenericRow row =
                     InternalRowPartitionComputer.convertSpecToInternalRow(
-                            spec, partitionType, defaultPartitionName);
+                            completedSpec, partitionType, defaultPartitionName);
             partitions.add(serializer.toBinaryRow(row).copy());
         }
     }
diff --git a/paimon-flink/paimon-flink-common/src/test/java/org/apache/paimon/flink/BatchFileStoreITCase.java b/paimon-flink/paimon-flink-common/src/test/java/org/apache/paimon/flink/BatchFileStoreITCase.java
index 6c9570dddc85..94f223f3de08 100644
--- a/paimon-flink/paimon-flink-common/src/test/java/org/apache/paimon/flink/BatchFileStoreITCase.java
+++ b/paimon-flink/paimon-flink-common/src/test/java/org/apache/paimon/flink/BatchFileStoreITCase.java
@@ -1101,6 +1101,16 @@ public void testScanWithSpecifiedPartitions() {
         assertThat(sql(query)).containsExactly(Row.of(1, 11), Row.of(1, 12), Row.of(2, 22));
     }
 
+    @Test
+    public void testScanWithPartialSpecifiedPartition() {
+        sql("CREATE TABLE P (dt STRING, hh INT, v INT) PARTITIONED BY (dt, hh)");
+        sql(
+                "INSERT INTO P VALUES ('20260814', CAST(NULL AS INT), 1), ('20260814', 10, 2), ('20260815', CAST(NULL AS INT), 3)");
+
+        assertThat(sql("SELECT COUNT(*) FROM P /*+ OPTIONS('scan.partitions' = 'dt=20260814') */"))
+                .containsExactly(Row.of(1L));
+    }
+
     @Test
     public void testScanWithSpecifiedPartitionsWithFieldMapping() {
         sql("CREATE TABLE P (id INT, v INT, pt STRING) PARTITIONED BY (pt)");