diff --git a/swift-lib/src/lib.swift b/swift-lib/src/lib.swift
index 9910043..beb8aa2 100644
--- a/swift-lib/src/lib.swift
+++ b/swift-lib/src/lib.swift
@@ -105,7 +105,7 @@ func computeSecureEnclaveP256Ecsign(privateKeyDataRepresentation: SRString, cont
         let digest = SHA256.hash(data: contentData)
         let signature = try p.signature(for: digest)
 
-        return SRString("ok:\(signature.derRepresentation.base64EncodedString()))")
+        return SRString("ok:\(signature.derRepresentation.base64EncodedString())")
     } catch {
         return SRString("err:\(error)")
     }