1 files changed, 2 insertions, 1 deletions
diff --git a/lib/complex.rb b/lib/complex.rb
index 2de1791288..c27746a82f 100644
--- a/lib/complex.rb
+++ b/lib/complex.rb
@@ -363,9 +363,10 @@ module Math
   alias sin! sin
   alias tan! tan
   alias log! log
+  alias atan! atan  
   alias log10! log10
   alias atan2! atan2
-  
+
   def sqrt(z)
     if Complex.generic?(z)
       if z >= 0