diff --git a/ocsp/ocsp.go b/ocsp/ocsp.go
index 1850e1b..99120b5 100644
--- a/ocsp/ocsp.go
+++ b/ocsp/ocsp.go
@@ -94,8 +94,8 @@ type singleResponse struct {
 }
 
 type revokedInfo struct {
-	RevocationTime time.Time `asn1:"generalized"`
-	Reason         int       `asn1:"explicit,tag:0,optional"`
+	RevocationTime time.Time       `asn1:"generalized"`
+	Reason         asn1.Enumerated `asn1:"explicit,tag:0,optional"`
 }
 
 var (
@@ -230,6 +230,7 @@ func getHashAlgorithmFromOID(target asn1.ObjectIdentifier) crypto.Hash {
 
 // This is the exposed reflection of the internal OCSP structures.
 
+// The status values that can be expressed in OCSP.  See RFC 6960.
 const (
 	// Good means that the certificate is valid.
 	Good = iota
@@ -241,6 +242,21 @@ const (
 	ServerFailed = iota
 )
 
+// The enumerated reasons for revoking a certificate.  See RFC 5280.
+const (
+	Unspecified          = iota
+	KeyCompromise        = iota
+	CACompromise         = iota
+	AffiliationChanged   = iota
+	Superseded           = iota
+	CessationOfOperation = iota
+	CertificateHold      = iota
+	_                    = iota
+	RemoveFromCRL        = iota
+	PrivilegeWithdrawn   = iota
+	AACompromise         = iota
+)
+
 // Request represents an OCSP request. See RFC 2560.
 type Request struct {
 	HashAlgorithm  crypto.Hash
@@ -399,7 +415,7 @@ func ParseResponse(bytes []byte, issuer *x509.Certificate) (*Response, error) {
 	default:
 		ret.Status = Revoked
 		ret.RevokedAt = r.Revoked.RevocationTime
-		ret.RevocationReason = r.Revoked.Reason
+		ret.RevocationReason = int(r.Revoked.Reason)
 	}
 
 	ret.ProducedAt = basicResp.TBSResponseData.ProducedAt
@@ -530,7 +546,7 @@ func CreateResponse(issuer, responderCert *x509.Certificate, template Response,
 	case Revoked:
 		innerResponse.Revoked = revokedInfo{
 			RevocationTime: template.RevokedAt.UTC(),
-			Reason:         template.RevocationReason,
+			Reason:         asn1.Enumerated(template.RevocationReason),
 		}
 	}
 
diff --git a/ocsp/ocsp_test.go b/ocsp/ocsp_test.go
index 5ea9eb2..d55682f 100644
--- a/ocsp/ocsp_test.go
+++ b/ocsp/ocsp_test.go
@@ -26,9 +26,9 @@ func TestOCSPDecode(t *testing.T) {
 	}
 
 	expected := Response{
-		Status:           0,
+		Status:           Good,
 		SerialNumber:     big.NewInt(0x1d0fa),
-		RevocationReason: 0,
+		RevocationReason: Unspecified,
 		ThisUpdate:       time.Date(2010, 7, 7, 15, 1, 5, 0, time.UTC),
 		NextUpdate:       time.Date(2010, 7, 7, 18, 35, 17, 0, time.UTC),
 	}
@@ -171,7 +171,7 @@ func TestOCSPResponse(t *testing.T) {
 		ThisUpdate:       thisUpdate,
 		NextUpdate:       nextUpdate,
 		RevokedAt:        thisUpdate,
-		RevocationReason: 1, // keyCompromise
+		RevocationReason: KeyCompromise,
 		Certificate:      responder,
 	}