1 files changed, 1 insertions, 0 deletions

diff --git a/src/w32.c b/src/w32.c
index 745642e946b..4024ed9512e 100644
--- a/src/w32.c
+++ b/src/w32.c
@@ -1963,6 +1963,7 @@ get_emacs_configuration_options (void)
     size += strlen (options[i]);
 
   options_buffer = xmalloc (size + 1);
+  options_buffer[0] = '\0';
 
   for (i = 0; options[i]; i++)
     strcat (options_buffer, options[i]);