diff --git a/metropolis/pkg/tpm/tpm.go b/metropolis/pkg/tpm/tpm.go
index 7973399..2dbe6f6 100644
--- a/metropolis/pkg/tpm/tpm.go
+++ b/metropolis/pkg/tpm/tpm.go
@@ -160,6 +160,9 @@
 	}
 	tpmName := tpms[0]
 	ueventData, err := sysfs.ReadUevents(filepath.Join("/sys/class/tpm", tpmName, "uevent"))
+	if err != nil {
+		return fmt.Errorf("failed to read uevents: %w", err)
+	}
 	majorDev, err := strconv.Atoi(ueventData["MAJOR"])
 	if err != nil {
 		return fmt.Errorf("failed to convert uevent: %w", err)