diff --git a/cpp/include/kvikio/shim/libcurl.hpp b/cpp/include/kvikio/shim/libcurl.hpp
index 0e6f49703e..1bd3683d93 100644
--- a/cpp/include/kvikio/shim/libcurl.hpp
+++ b/cpp/include/kvikio/shim/libcurl.hpp
@@ -156,7 +156,7 @@ class CurlHandle {
    * @param source_file Path of source file of the caller (for error messages).
    * @param source_line Line of source file of the caller (for error messages).
    */
-  CurlHandle(LibCurl::UniqueHandlePtr handle, char* const source_file, std::string source_line)
+  CurlHandle(LibCurl::UniqueHandlePtr handle, char const* source_file, std::string source_line)
     : _handle{std::move(handle)}, _source_file(source_file), _source_line(std::move(source_line))
   {
     // Need CURLOPT_NOSIGNAL to support threading, see