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-rw-r--r--src/lib/mac/hmac/hmac.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/lib/mac/hmac/hmac.h b/src/lib/mac/hmac/hmac.h
index 5154739d2..654a167e7 100644
--- a/src/lib/mac/hmac/hmac.h
+++ b/src/lib/mac/hmac/hmac.h
@@ -34,7 +34,7 @@ class BOTAN_DLL HMAC final : public MessageAuthenticationCode
/**
* @param hash the hash to use for HMACing
*/
- HMAC(HashFunction* hash);
+ explicit HMAC(HashFunction* hash);
static HMAC* make(const Spec& spec);