diff --git a/frontend/attestations/sbom/sbom.go b/frontend/attestations/sbom/sbom.go
index 54e8e316a2a2..4d86f74140bf 100644
--- a/frontend/attestations/sbom/sbom.go
+++ b/frontend/attestations/sbom/sbom.go
@@ -88,7 +88,7 @@ func CreateSBOMScanner(ctx context.Context, resolver llb.ImageMetaResolver, scan
 			Kind: gatewaypb.AttestationKindBundle,
 			Ref:  stsbom,
 			Metadata: map[string][]byte{
-				result.AttestationReasonKey: result.AttestationReasonSBOM,
+				result.AttestationReasonKey: []byte(result.AttestationReasonSBOM),
 			},
 			InToto: result.InTotoAttestation{
 				PredicateType: intoto.PredicateSPDX,
diff --git a/solver/llbsolver/proc/provenance.go b/solver/llbsolver/proc/provenance.go
index 4d8506b2987f..e1b6ed96ee6e 100644
--- a/solver/llbsolver/proc/provenance.go
+++ b/solver/llbsolver/proc/provenance.go
@@ -45,7 +45,7 @@ func ProvenanceProcessor(attrs map[string]string) llbsolver.Processor {
 			res.AddAttestation(p.ID, llbsolver.Attestation{
 				Kind: gatewaypb.AttestationKindInToto,
 				Metadata: map[string][]byte{
-					result.AttestationReasonKey:     result.AttestationReasonProvenance,
+					result.AttestationReasonKey:     []byte(result.AttestationReasonProvenance),
 					result.AttestationInlineOnlyKey: []byte(strconv.FormatBool(inlineOnly)),
 				},
 				InToto: result.InTotoAttestation{
diff --git a/solver/result/attestation.go b/solver/result/attestation.go
index 6fa8403db67c..450016ffab70 100644
--- a/solver/result/attestation.go
+++ b/solver/result/attestation.go
@@ -12,9 +12,9 @@ const (
 	AttestationInlineOnlyKey = "inline-only"
 )
 
-var (
-	AttestationReasonSBOM       = []byte("sbom")
-	AttestationReasonProvenance = []byte("provenance")
+const (
+	AttestationReasonSBOM       = "sbom"
+	AttestationReasonProvenance = "provenance"
 )
 
 type Attestation[T any] struct {