fix warnings

1 files changed, 1 insertions, 1 deletions

diff --git a/src/exporter.cpp b/src/exporter.cpp
index 74c77c1..54d2b59 100644
--- a/src/exporter.cpp
+++ b/src/exporter.cpp
@@ -53,7 +53,7 @@ static int _send_email_t(void* arg) {
     return 0;
 }
 
-exporter::export_request* exporter::send_email(char* sender, char* recipient, const char* subject, const char* text, send_email_callback ev)
+exporter::export_request* exporter::send_email(const char* sender, const char* recipient, const char* subject, const char* text, send_email_callback ev)
 {
     exporter::export_request* result = (exporter::export_request*)memops::alloc(sizeof(exporter::export_request));
     result->started_at = time(NULL);