diff --git a/install.sh b/install.sh
index 86f5943..348dd84 100755
--- a/install.sh
+++ b/install.sh
@@ -16,6 +16,17 @@ zaf_fetch_url(){
 	curl -f -k -s -L -o - "$1"
 }
 
+# Lite version of zaf_which, full version will be loaded later
+zaf_which() {
+	if which >/dev/null 2>/dev/null; then
+		which "$1"
+	else
+		[ -x /bin/$1 ] && { echo /bin/$1; return; }
+		[ -x /usr/bin/$1 ] && { echo /usr/bin/$1; return; }
+		return 1
+	fi
+}
+
 # Lite version of zaf_err, full version will be loaded later
 zaf_err() {
 	logger ${ZAF_LOG_STDERR} -p user.err -t zaf-error -- $@
diff --git a/lib/zaf.lib.sh b/lib/zaf.lib.sh
index c6f13d6..58d4749 100644
--- a/lib/zaf.lib.sh
+++ b/lib/zaf.lib.sh
@@ -266,7 +266,7 @@ zaf_random() {
 
 # Emulate sudo
 zaf_sudo() {
-	if zaf_is_root || ! which sudo >/dev/null 2>/dev/null; then
+	if zaf_is_root || ! zaf_which sudo >/dev/null 2>/dev/null; then
 		$@
 	else
 		sudo $@