diff --git a/functions.cpp b/functions.cpp
index b4d8abaa5b..a7f9377f8f 100644
--- a/functions.cpp
+++ b/functions.cpp
@@ -758,7 +758,7 @@ namespace Sass {
       return least;
     }
 
-    Signature max_sig = "max($x2, $x2...)";
+    Signature max_sig = "max($x1, $x2...)";
     BUILT_IN(max)
     {
       Number* x1 = ARG("$x1", Number);