Index: agent/ssm/service.go
--- agent/ssm/service.go.orig
+++ agent/ssm/service.go
@@ -255,7 +255,7 @@ func (svc *sdkService) UpdateInstanceInformation(
 	switch goOS {
 	case "windows":
 		params.PlatformType = aws.String(ssm.PlatformTypeWindows)
-	case "linux", "freebsd":
+	case "linux", "freebsd", "openbsd":
 		params.PlatformType = aws.String(ssm.PlatformTypeLinux)
 	case "darwin":
 		params.PlatformType = aws.String(ssm.PlatformTypeMacOs)