diff --git a/DigitalData.Core.Security/JwtSignatureService.cs b/DigitalData.Core.Security/JwtSignatureService.cs
index 9bcdf4b..58e4c6c 100644
--- a/DigitalData.Core.Security/JwtSignatureService.cs
+++ b/DigitalData.Core.Security/JwtSignatureService.cs
@@ -15,9 +15,9 @@ namespace DigitalData.Core.Security
 
         private readonly IEnumerable<TokenDescription>? _tokenDescriptions;
 
-        private readonly AsymCryptHandler _cryptHandler;
+        private readonly IAsymCryptHandler _cryptHandler;
 
-        public JwtSignatureService(IOptions<ClaimDescriptor<TPrincipal>> claimDescriptorOptions, IMapper mapper, IOptions<IEnumerable<TokenDescription>>? tokenDescriptionOptions, AsymCryptHandler asymCryptHandler)
+        public JwtSignatureService(IOptions<ClaimDescriptor<TPrincipal>> claimDescriptorOptions, IMapper mapper, IOptions<IEnumerable<TokenDescription>>? tokenDescriptionOptions, IAsymCryptHandler asymCryptHandler)
         {
             _claimDescriptor = claimDescriptorOptions.Value;
             _mapper = mapper;