diff --git a/sql-common/oci/ssl.cc b/sql-common/oci/ssl.cc
index b0e813b58e2c..5a7c666ebfb4 100644
--- a/sql-common/oci/ssl.cc
+++ b/sql-common/oci/ssl.cc
@@ -51,7 +51,7 @@ std::string base64_encode(const void *binary, size_t length) {
   BIO_push(b64.get(), sink);
   BIO_write(b64.get(), binary, static_cast<int>(length));
   if (BIO_flush(b64.get()) != 1) return {};
-  const char *encoded;
+  char *encoded;
   const size_t result_length = BIO_get_mem_data(sink, &encoded);
   return {encoded, result_length};
 }