diff --git a/lib/haproxyctl/environment.rb b/lib/haproxyctl/environment.rb
index aee53fd..a522319 100644
--- a/lib/haproxyctl/environment.rb
+++ b/lib/haproxyctl/environment.rb
@@ -38,8 +38,11 @@ def exec
 
     def nbproc 
       @nbproc ||= begin
-        config.match /nbproc \s*(\d*)\s*/
-        Regexp.last_match[1].to_i || 1
+        if config.match(/nbproc \s*(\d*)\s*/)
+          Regexp.last_match[1].to_i
+        else
+          1
+        end
       end
     end