diff --git a/src/lib.sh b/src/lib.sh
index 2fcee1b..d60e7c5 100644
--- a/src/lib.sh
+++ b/src/lib.sh
@@ -1,4 +1,4 @@
-std::mod::init clap 0.1.0
+std::mod::init clap 0.1.1
 
 ##
 # must be called after declaring a `clap__flags` as associative arrays, where:
@@ -81,11 +81,11 @@ clap::parse() {
 }
 
 clap::flag::is-short() {
-	[ "${1:0:1}" == "-" ] && [ "${1:1:1}" != "-" ]
+	[[ "${1:0:1}" == "-" ]] && [[ "${1:1:1}" != "-" ]]
 }
 
 clap::flag::is-long() {
-	[ "${1:0:1}" == "-" ] && [ "${1:1:1}" == "-" ]
+	[[ "${1:0:1}" == "-" ]] && [[ "${1:1:1}" == "-" ]]
 }
 
 ##