1 files changed, 1 insertions, 1 deletions
diff --git a/Source/cmCurl.h b/Source/cmCurl.h
index 9c1e337..b5134f4 100644
--- a/Source/cmCurl.h
+++ b/Source/cmCurl.h
@@ -8,7 +8,7 @@
 
 #include <cm3p/curl/curl.h>
 
-std::string cmCurlSetCAInfo(::CURL* curl, const char* cafile = nullptr);
+std::string cmCurlSetCAInfo(::CURL* curl, const std::string& cafile = {});
 std::string cmCurlSetNETRCOption(::CURL* curl, const std::string& netrc_level,
                                  const std::string& netrc_file);
 std::string cmCurlFixFileURL(std::string url);