diff --git a/collectors/gpfsMetric.go b/collectors/gpfsMetric.go
index bc1852b..53db1c2 100644
--- a/collectors/gpfsMetric.go
+++ b/collectors/gpfsMetric.go
@@ -130,14 +130,21 @@ func (m *GpfsCollector) Read(interval time.Duration, output chan lp.CCMetric) {
 				continue
 			}
 
-			timestampInt, err := strconv.ParseInt(key_value["_t_"]+key_value["_tu_"], 10, 64)
-			timestamp := time.UnixMicro(timestampInt)
+			sec, err := strconv.ParseInt(key_value["_t_"], 10, 64)
 			if err != nil {
 				fmt.Fprintf(os.Stderr,
-					"GpfsCollector.Read(): Failed to convert time stamp '%s': %s\n",
-					key_value["_t_"]+key_value["_tu_"], err.Error())
+					"GpfsCollector.Read(): Failed to convert seconds to int '%s': %v\n",
+					key_value["_t_"], err)
 				continue
 			}
+			msec, err := strconv.ParseInt(key_value["_tu_"], 10, 64)
+			if err != nil {
+				fmt.Fprintf(os.Stderr,
+					"GpfsCollector.Read(): Failed to convert micro seconds to int '%s': %v\n",
+					key_value["_tu_"], err)
+				continue
+			}
+			timestamp := time.Unix(sec, msec*1000)
 
 			// bytes read
 			bytesRead, err := strconv.ParseInt(key_value["_br_"], 10, 64)
diff --git a/go.mod b/go.mod
index da4f3ea..0789f7e 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/ClusterCockpit/cc-metric-collector
 
-go 1.17
+go 1.16
 
 require (
 	github.com/NVIDIA/go-nvml v0.11.1-0
@@ -12,14 +12,7 @@ require (
 )
 
 require (
-	github.com/deepmap/oapi-codegen v1.8.2 // indirect
 	github.com/golang/protobuf v1.5.2 // indirect
 	github.com/nats-io/nats-server/v2 v2.7.0 // indirect
-	github.com/nats-io/nkeys v0.3.0 // indirect
-	github.com/nats-io/nuid v1.0.1 // indirect
-	github.com/pkg/errors v0.9.1 // indirect
-	golang.org/x/crypto v0.0.0-20220112180741-5e0467b6c7ce // indirect
-	golang.org/x/net v0.0.0-20211112202133-69e39bad7dc2 // indirect
 	google.golang.org/protobuf v1.27.1 // indirect
-	gopkg.in/yaml.v2 v2.3.0 // indirect
 )