diff --git a/velox/common/base/SpillStats.h b/velox/common/base/SpillStats.h
index 61f0efd592ef..ff276853a4c4 100644
--- a/velox/common/base/SpillStats.h
+++ b/velox/common/base/SpillStats.h
@@ -141,3 +141,13 @@ void updateGlobalMaxSpillLevelExceededCount(
 /// Gets the cumulative global spill stats.
 SpillStats globalSpillStats();
 } // namespace facebook::velox::common
+
+template <>
+struct fmt::formatter<facebook::velox::common::SpillStats>
+    : fmt::formatter<std::string> {
+  auto format(
+      const facebook::velox::common::SpillStats& s,
+      format_context& ctx) {
+    return formatter<std::string>::format(s.toString(), ctx);
+  }
+};
diff --git a/velox/common/base/tests/SpillStatsTest.cpp b/velox/common/base/tests/SpillStatsTest.cpp
index 7a74c1e09a7d..376ae6b6c8ab 100644
--- a/velox/common/base/tests/SpillStatsTest.cpp
+++ b/velox/common/base/tests/SpillStatsTest.cpp
@@ -105,4 +105,7 @@ TEST(SpillTest, spillStats) {
   ASSERT_EQ(
       stats2.toString(),
       "spillRuns[100] spilledInputBytes[2.00KB] spilledBytes[1.00KB] spilledRows[1031] spilledPartitions[1025] spilledFiles[1026] spillFillTimeUs[1.03ms] spillSortTime[1.03ms] spillSerializationTime[1.03ms] spillWrites[1028] spillFlushTime[1.03ms] spillWriteTime[1.03ms] maxSpillExceededLimitCount[4]");
+  ASSERT_EQ(
+      fmt::format("{}", stats2),
+      "spillRuns[100] spilledInputBytes[2.00KB] spilledBytes[1.00KB] spilledRows[1031] spilledPartitions[1025] spilledFiles[1026] spillFillTimeUs[1.03ms] spillSortTime[1.03ms] spillSerializationTime[1.03ms] spillWrites[1028] spillFlushTime[1.03ms] spillWriteTime[1.03ms] maxSpillExceededLimitCount[4]");
 }
diff --git a/velox/common/memory/MemoryArbitrator.h b/velox/common/memory/MemoryArbitrator.h
index 4791e1a6cc93..e0ee291927b9 100644
--- a/velox/common/memory/MemoryArbitrator.h
+++ b/velox/common/memory/MemoryArbitrator.h
@@ -243,6 +243,11 @@ class MemoryArbitrator {
   const bool checkUsageLeak_;
 };
 
+/// Formatter for fmt.
+FOLLY_ALWAYS_INLINE std::string format_as(MemoryArbitrator::Stats stats) {
+  return stats.toString();
+}
+
 FOLLY_ALWAYS_INLINE std::ostream& operator<<(
     std::ostream& o,
     const MemoryArbitrator::Stats& stats) {
diff --git a/velox/common/memory/tests/MemoryArbitratorTest.cpp b/velox/common/memory/tests/MemoryArbitratorTest.cpp
index cc9851e8a95d..316a6e90d92c 100644
--- a/velox/common/memory/tests/MemoryArbitratorTest.cpp
+++ b/velox/common/memory/tests/MemoryArbitratorTest.cpp
@@ -57,6 +57,13 @@ TEST_F(MemoryArbitrationTest, stats) {
       "queueTime 230.00ms arbitrationTime 1.02ms reclaimTime 1.00ms "
       "shrunkMemory 95.37MB reclaimedMemory 9.77KB "
       "maxCapacity 0B freeCapacity 0B]");
+  ASSERT_EQ(
+      fmt::format("{}", stats),
+      "STATS[numRequests 2 numSucceeded 0 numAborted 3 numFailures 100 "
+      "numNonReclaimableAttempts 5 numReserves 0 numReleases 0 "
+      "queueTime 230.00ms arbitrationTime 1.02ms reclaimTime 1.00ms "
+      "shrunkMemory 95.37MB reclaimedMemory 9.77KB "
+      "maxCapacity 0B freeCapacity 0B]");
 }
 
 TEST_F(MemoryArbitrationTest, create) {