diff --git a/ChangeLog b/ChangeLog
index 12ea3bb135..53d2e44014 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed Jan 30 13:53:43 2013  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
+
+	* lib/matrix.rb: Take conjugate for inner product
+	[rubyspec:5a01ad5719f2] [ruby-dev:46101]
+
 Wed Jan 30 13:22:05 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* parse.y (local_push_gen): warn assigned but unused variables also in
diff --git a/lib/matrix.rb b/lib/matrix.rb
index cf23d4159d..7a3857ae99 100644
--- a/lib/matrix.rb
+++ b/lib/matrix.rb
@@ -1752,7 +1752,7 @@ class Vector
 
     p = 0
     each2(v) {|v1, v2|
-      p += v1 * v2
+      p += v1 * v2.conj
     }
     p
   end