diff --git a/test/log.cc b/test/log.cc
index 8697effd..6ad33ced 100644
--- a/test/log.cc
+++ b/test/log.cc
@@ -285,3 +285,5 @@ void log_trouble(const char *where, const char *what, int errnum) {
 bool log_enabled(const logging::loglevel priority) {
   return (priority >= logging::level);
 }
+
+void log_flush(void) { fflushall(); }
diff --git a/test/log.h b/test/log.h
index c321f3ce..81eaf2ca 100644
--- a/test/log.h
+++ b/test/log.h
@@ -81,6 +81,7 @@ void __printf_args(1, 2) log_warning(const char *msg, ...);
 void __printf_args(1, 2) log_error(const char *msg, ...);
 
 void log_trouble(const char *where, const char *what, int errnum);
+void log_flush(void);
 bool log_enabled(const logging::loglevel priority);
 
 #ifdef _DEBUG