diff --git a/include/openssl/base.h b/include/openssl/base.h
index 8162db3..f00c563 100644
--- a/include/openssl/base.h
+++ b/include/openssl/base.h
@@ -197,7 +197,7 @@
 #define OPENSSL_MSVC_PRAGMA(arg)
 #endif
 
-#if defined(__GNUC__)
+#if defined(__GNUC__) || defined(__clang__)
 #define OPENSSL_UNUSED __attribute__((unused))
 #else
 #define OPENSSL_UNUSED