diff --git a/swaylock-script b/swaylock-script
index d95572d..40c5d6e 100755
--- a/swaylock-script
+++ b/swaylock-script
@@ -47,7 +47,7 @@ option_sw_effects="-f \
 
 option_sw=""
 
-if [ "${sleep_flag}" == "set" ]
+if [ ! "${sleep_flag}" == "set" ]
 then
     option_sw_effects="${option_sw_effects} \
         --fade-in 4"