diff --git a/ssm b/ssm
index e9dbee2..3b0847b 100755
--- a/ssm
+++ b/ssm
@@ -2,7 +2,7 @@
 shopt -s nullglob
 
 # Utility functions
-is_function() [[ $(type -t $1 2>/dev/null) == 'function' ]]
+is_function() [[ "$(type -t "$1" 2>/dev/null)" == 'function' ]]
 readonly -f is_function
 
 usage() {
@@ -128,7 +128,7 @@ if_service_action() {
 		is_function "$f" && return 0
 	done
 
-	return 0
+	return 1
 }; readonly -f if_service_action
 
 run_service_action() {