diff --git a/bash-preexec.sh b/bash-preexec.sh
index bc98976..6f26569 100644
--- a/bash-preexec.sh
+++ b/bash-preexec.sh
@@ -43,7 +43,7 @@ fi
 
 # We only support Bash 3.1+.
 # Note: BASH_VERSINFO is first available in Bash-2.0.
-if [[ -z "${BASH_VERSINFO-}" || BASH_VERSINFO[0] -lt 3 || BASH_VERSINFO[0] -eq 3 && BASH_VERSINFO[1] -lt 1 ]]; then
+if [[ -z "${BASH_VERSINFO-}" ]] || (( BASH_VERSINFO[0] < 3 || (BASH_VERSINFO[0] == 3 && BASH_VERSINFO[1] < 1) )); then
     return 1
 fi