diff --git a/Source/exehead/Main.c b/Source/exehead/Main.c
index f7d560ed..e246451c 100644
--- a/Source/exehead/Main.c
+++ b/Source/exehead/Main.c
@@ -54,6 +54,7 @@ char *ValidateTempDir()
   validate_filename(state_temp_dir);
   if (!validpathspec(state_temp_dir))
     return NULL;
+  addtrailingslash(state_temp_dir);
   CreateDirectory(state_temp_dir, NULL);
   // g_caption is used as a temp var here
   return my_GetTempFileName(g_caption, state_temp_dir);