diff --git a/markets/dagstore/wrapper.go b/markets/dagstore/wrapper.go
index 620c97abe..9a31d68c3 100644
--- a/markets/dagstore/wrapper.go
+++ b/markets/dagstore/wrapper.go
@@ -90,7 +90,7 @@ func NewDAGStore(cfg config.DAGStoreConfig, mountApi MinerAPI) (*dagstore.DAGSto
 		mountApi:   mountApi,
 		failureCh:  failureCh,
 		traceCh:    traceCh,
-		gcInterval: time.Duration(cfg.GCIntervalMillis) * time.Millisecond,
+		gcInterval: time.Duration(cfg.GCInterval),
 	}
 
 	return dagst, w, nil
diff --git a/markets/dagstore/wrapper_test.go b/markets/dagstore/wrapper_test.go
index c6e4e2f38..a48497d85 100644
--- a/markets/dagstore/wrapper_test.go
+++ b/markets/dagstore/wrapper_test.go
@@ -29,10 +29,10 @@ func TestWrapperAcquireRecovery(t *testing.T) {
 
 	// Create a DAG store wrapper
 	dagst, w, err := NewDAGStore(config.DAGStoreConfig{
-		TransientsDir:    t.TempDir(),
-		IndexDir:         t.TempDir(),
-		DatastoreDir:     t.TempDir(),
-		GCIntervalMillis: 1,
+		TransientsDir: t.TempDir(),
+		IndexDir:      t.TempDir(),
+		DatastoreDir:  t.TempDir(),
+		GCInterval:    config.Duration(1 * time.Millisecond),
 	}, mockLotusMount{})
 	require.NoError(t, err)
 
@@ -82,10 +82,10 @@ func TestWrapperBackground(t *testing.T) {
 
 	// Create a DAG store wrapper
 	dagst, w, err := NewDAGStore(config.DAGStoreConfig{
-		TransientsDir:    t.TempDir(),
-		IndexDir:         t.TempDir(),
-		DatastoreDir:     t.TempDir(),
-		GCIntervalMillis: 1,
+		TransientsDir: t.TempDir(),
+		IndexDir:      t.TempDir(),
+		DatastoreDir:  t.TempDir(),
+		GCInterval:    config.Duration(1 * time.Millisecond),
 	}, mockLotusMount{})
 	require.NoError(t, err)
 
diff --git a/node/config/def.go b/node/config/def.go
index 9b76a2226..7637142cd 100644
--- a/node/config/def.go
+++ b/node/config/def.go
@@ -195,7 +195,7 @@ func DefaultStorageMiner() *StorageMiner {
 			MaxConcurrentIndex:         5,
 			MaxConcurrentReadyFetches:  2,
 			MaxConcurrencyStorageCalls: 100,
-			GCIntervalMillis:           60000,
+			GCInterval:                 Duration(1 * time.Minute),
 		},
 	}
 	cfg.Common.API.ListenAddress = "/ip4/127.0.0.1/tcp/2345/http"
diff --git a/node/config/types.go b/node/config/types.go
index b3f038df4..9f77ee7a4 100644
--- a/node/config/types.go
+++ b/node/config/types.go
@@ -86,9 +86,10 @@ type DAGStoreConfig struct {
 	// Default value: 100.
 	MaxConcurrencyStorageCalls int
 
-	// The number of milliseconds between calls to periodic dagstore GC.
-	// Default value: 60000 (60 seconds = 1 minute).
-	GCIntervalMillis int
+	// The time between calls to periodic dagstore GC, in time.Duration string
+	// representation, e.g. 1m, 5m, 1h.
+	// Default value: 1 minute.
+	GCInterval Duration
 }
 
 type MinerSubsystemConfig struct {