diff --git a/lib/vtls/openssl.c b/lib/vtls/openssl.c
index d257d94900..a9ba330385 100644
--- a/lib/vtls/openssl.c
+++ b/lib/vtls/openssl.c
@@ -253,7 +253,7 @@ static void ossl_keylog_callback(const SSL *ssl, const char *line)
       if(!buf)
         return;
     }
-    strncpy(buf, line, linelen);
+    memcpy(buf, line, linelen);
     buf[linelen] = '\n';
     buf[linelen + 1] = '\0';