diff --git a/main/fastcgi.c b/main/fastcgi.c
index 448576a978598..bee1fa47e662e 100644
--- a/main/fastcgi.c
+++ b/main/fastcgi.c
@@ -944,7 +944,7 @@ static inline ssize_t safe_write(fcgi_request *req, const void *buf, size_t coun
 	return n;
 }
 
-static inline ssize_t safe_read(fcgi_request *req, const void *buf, size_t count)
+static inline ssize_t safe_read(fcgi_request *req, void *buf, size_t count)
 {
 	int    ret;
 	size_t n = 0;