diff --git a/csync/src/csync_log.h b/csync/src/csync_log.h
index 38f5f9cac..0cd0d01fc 100644
--- a/csync/src/csync_log.h
+++ b/csync/src/csync_log.h
@@ -61,7 +61,7 @@ enum csync_log_priority_e {
 };
 
 #define CSYNC_LOG(priority, ...) \
-  csync_log(priority, __FUNCTION__, __VA_ARGS__)
+  csync_log(priority, __func__, __VA_ARGS__)
 
 void csync_log(int verbosity,
                const char *function,
diff --git a/csync/src/httpbf/src/httpbf.c b/csync/src/httpbf/src/httpbf.c
index 815b07e13..2489e8d48 100644
--- a/csync/src/httpbf/src/httpbf.c
+++ b/csync/src/httpbf/src/httpbf.c
@@ -42,7 +42,7 @@
 #define DEBUG_HBF(...) { if(transfer->log_cb) { \
         char buf[1024];                         \
         snprintf(buf, 1024, __VA_ARGS__);       \
-        transfer->log_cb(__FUNCTION__, buf, transfer->user_data);    \
+        transfer->log_cb(__func__, buf, transfer->user_data);    \
   }  }
 
 // #endif
diff --git a/csync/tests/csync_tests/check_csync_log.c b/csync/tests/csync_tests/check_csync_log.c
index 4c88c149d..65a8ae9b2 100644
--- a/csync/tests/csync_tests/check_csync_log.c
+++ b/csync/tests/csync_tests/check_csync_log.c
@@ -131,7 +131,7 @@ static void check_logging(void **state)
     rc = csync_set_log_callback(check_log_callback);
     assert_int_equal(rc, 0);
 
-    csync_log(1, __FUNCTION__, "rc = %d", rc);
+    csync_log(1, __func__, "rc = %d", rc);
 
     rc = _tstat(path, &sb);