diff --git a/ChangeLog b/ChangeLog
index ac681c8222..903ec0ab69 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Tue Dec  5 00:59:05 2006  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* misc/ruby-mode.el (ruby-parse-partial): need to parse "/=" as
+	  self assignment operator, not regex.  [ruby-talk:227324]
+
 Tue Dec  5 00:19:14 2006  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* intern.h, object.c, variable.c (rb_mod_constants): added an optional
diff --git a/lib/matrix.rb b/lib/matrix.rb
index 2f70de419e..8142a52315 100644
--- a/lib/matrix.rb
+++ b/lib/matrix.rb
@@ -745,7 +745,7 @@ class Matrix
         det *= -1
       end
       (k + 1).upto(size) do |i|
-        q = a[i][k] / a[k][k]
+        q = a[i][k].quo(a[k][k])
         k.upto(size) do |j|
           a[i][j] -= a[k][j] * q
         end
@@ -846,7 +846,7 @@ class Matrix
           a[pi], a[i] = a[i], a[pi]
         end
         (pi + 1 ... a_row_size).each do |k|
-          q = a[k][j] / a[pi][j]
+          q = a[k][j].quo(a[pi][j])
           (pi ... a_column_size).each do |j0|
             a[k][j0] -= q * a[pi][j0]
           end