diff --git a/include/jemalloc/internal/prof_externs.h b/include/jemalloc/internal/prof_externs.h
index e5d6ff7b..d644be64 100644
--- a/include/jemalloc/internal/prof_externs.h
+++ b/include/jemalloc/internal/prof_externs.h
@@ -96,6 +96,8 @@ size_t prof_tdata_count(void);
 size_t prof_bt_count(void);
 typedef int (prof_dump_open_file_t)(const char *, int);
 extern prof_dump_open_file_t *JET_MUTABLE prof_dump_open_file;
+typedef ssize_t (prof_dump_write_file_t)(int, const void *, size_t);
+extern prof_dump_write_file_t *JET_MUTABLE prof_dump_write_file;
 typedef bool (prof_dump_header_t)(tsdn_t *, bool, const prof_cnt_t *);
 extern prof_dump_header_t *JET_MUTABLE prof_dump_header;
 typedef int (prof_dump_open_maps_t)();
diff --git a/src/prof_data.c b/src/prof_data.c
index b9b211d4..0de728b0 100644
--- a/src/prof_data.c
+++ b/src/prof_data.c
@@ -488,6 +488,8 @@ prof_dump_open(bool propagate_err, const char *filename) {
 	return fd;
 }
 
+prof_dump_write_file_t *JET_MUTABLE prof_dump_write_file = malloc_write_fd;
+
 static bool
 prof_dump_flush(bool propagate_err) {
 	bool ret = false;
@@ -495,10 +497,11 @@ prof_dump_flush(bool propagate_err) {
 
 	cassert(config_prof);
 
-	err = malloc_write_fd(prof_dump_fd, prof_dump_buf, prof_dump_buf_end);
+	err = prof_dump_write_file(prof_dump_fd, prof_dump_buf,
+	    prof_dump_buf_end);
 	if (err == -1) {
 		if (!propagate_err) {
-			malloc_write("<jemalloc>: write() failed during heap "
+			malloc_write("<jemalloc>: failed to write during heap "
 			    "profile flush\n");
 			if (opt_abort) {
 				abort();