diff --git a/src/tmux.cr b/src/tmux.cr
index ab3f954..910b1d5 100644
--- a/src/tmux.cr
+++ b/src/tmux.cr
@@ -209,7 +209,7 @@ class Tmux
   end
 
   def set_global_option(name, value)
-    exec(["set-option", "-g", name, value].join(' '))
+    exec(Process.quote(["set-option", "-g", name, value]))
   end
 
   def get_global_option(name)