diff --git a/src/core/support/log_win32.c b/src/core/support/log_win32.c
index 28e7768f808..40adcd1b501 100644
--- a/src/core/support/log_win32.c
+++ b/src/core/support/log_win32.c
@@ -106,6 +106,7 @@ void gpr_default_log(gpr_log_func_args *args) {
           gpr_log_severity_string(args->severity), time_buffer,
           (int)(now.tv_nsec), GetCurrentThreadId(), display_file, args->line,
           args->message);
+  fflush(stderr);
 }
 
 char *gpr_format_message(DWORD messageid) {