diff --git a/internal/cli/run/run.go b/internal/cli/run/run.go
index 5544153..b6125bc 100644
--- a/internal/cli/run/run.go
+++ b/internal/cli/run/run.go
@@ -12,6 +12,7 @@ import (
 	"github.com/ooni/probe-cli/internal/database"
 	"github.com/ooni/probe-cli/nettests"
 	"github.com/ooni/probe-cli/nettests/groups"
+	"github.com/ooni/probe-cli/utils"
 )
 
 func init() {
@@ -55,7 +56,7 @@ func init() {
 			log.Debugf("Running test %T", nt)
 			msmtPath := filepath.Join(ctx.TempDir,
 				fmt.Sprintf("msmt-%T-%s.jsonl", nt,
-					time.Now().UTC().Format(time.RFC3339Nano)))
+					time.Now().UTC().Format(utils.ResultTimestamp)))
 
 			ctl := nettests.NewController(nt, ctx, result, msmtPath)
 			if err = nt.Run(ctl); err != nil {
diff --git a/utils/paths.go b/utils/paths.go
index cf37c86..63ce079 100644
--- a/utils/paths.go
+++ b/utils/paths.go
@@ -30,12 +30,13 @@ func DBDir(home string, name string) string {
 	return filepath.Join(home, "db", fmt.Sprintf("%s.sqlite3", name))
 }
 
-const resultdirFormat = "2006-01-02T150405.999999999Z0700"
+// ResultTimestamp is a windows friendly timestamp
+const ResultTimestamp = "2006-01-02T150405.999999999Z0700"
 
 // MakeResultsDir creates and returns a directory for the result
 func MakeResultsDir(home string, name string, ts time.Time) (string, error) {
 	p := filepath.Join(home, "msmts",
-		fmt.Sprintf("%s-%s", name, ts.Format(resultdirFormat)))
+		fmt.Sprintf("%s-%s", name, ts.Format(ResultTimestamp)))
 
 	// If the path already exists, this is a problem. It should not clash, because
 	// we are using nanosecond precision for the starttime.