diff --git a/v3/lint/source.go b/v3/lint/source.go
index aefeb8186..e0b19d941 100644
--- a/v3/lint/source.go
+++ b/v3/lint/source.go
@@ -51,7 +51,7 @@ func (s *LintSource) UnmarshalJSON(data []byte) error {
 	}
 
 	switch LintSource(throwAway) {
-	case RFC5280, RFC5480, RFC5891, CABFBaselineRequirements, CABFEVGuidelines, MozillaRootStorePolicy, AppleRootStorePolicy, Community, EtsiEsi:
+	case RFC5280, RFC5480, RFC5891, CABFBaselineRequirements, CABFEVGuidelines, CABFSMIMEBaselineRequirements, MozillaRootStorePolicy, AppleRootStorePolicy, Community, EtsiEsi:
 		*s = LintSource(throwAway)
 		return nil
 	default:
@@ -79,6 +79,8 @@ func (s *LintSource) FromString(src string) {
 		*s = CABFBaselineRequirements
 	case CABFEVGuidelines:
 		*s = CABFEVGuidelines
+	case CABFSMIMEBaselineRequirements:
+		*s = CABFSMIMEBaselineRequirements
 	case MozillaRootStorePolicy:
 		*s = MozillaRootStorePolicy
 	case AppleRootStorePolicy:
diff --git a/v3/zlint.go b/v3/zlint.go
index 132aaf56b..7cb773f88 100644
--- a/v3/zlint.go
+++ b/v3/zlint.go
@@ -24,6 +24,7 @@ import (
 	_ "github.com/zmap/zlint/v3/lints/apple"
 	_ "github.com/zmap/zlint/v3/lints/cabf_br"
 	_ "github.com/zmap/zlint/v3/lints/cabf_ev"
+	_ "github.com/zmap/zlint/v3/lints/cabf_smime_br"
 	_ "github.com/zmap/zlint/v3/lints/community"
 	_ "github.com/zmap/zlint/v3/lints/etsi"
 	_ "github.com/zmap/zlint/v3/lints/mozilla"