diff --git a/stdout-flush-wrapper-debug.sh b/stdout-flush-wrapper-debug.sh
index 00a6231..40567fa 100755
--- a/stdout-flush-wrapper-debug.sh
+++ b/stdout-flush-wrapper-debug.sh
@@ -6,7 +6,7 @@
 # but not completely, so we just give LAVA more time with some sleep after
 # command termination.
 
-if [ "$1" == "--version" ]; then
+if [ "$1" = "--version" ]; then
     echo "$0 1.0"
     exit
 fi