diff --git a/src/common/crypto/Algorithm.h b/src/common/crypto/Algorithm.h
index 14ba1f32..b2081af5 100644
--- a/src/common/crypto/Algorithm.h
+++ b/src/common/crypto/Algorithm.h
@@ -51,7 +51,7 @@ public:
         m_variant(VARIANT_AUTO)
     {}
 
-    inline Algorithm(Algo algo, Variant variant) :
+    inline Algorithm(Algo algo, Variant variant = VARIANT_AUTO) :
         m_flags(0),
         m_variant(variant)
     {