diff --git a/cpp/configure.in b/cpp/configure.in
index a4cb4d8..8c59dda 100644
--- a/cpp/configure.in
+++ b/cpp/configure.in
@@ -33,7 +33,7 @@ if test "$msgpack_cv_atomic_ops" != "yes"; then
 Note that gcc < 4.1 is not supported.
 
 If you are using gcc >= 4.1 and the default target CPU architecture is "i386", try to
-add CFLAGS="--march=i686" and CXXFLAGS="-march=i668" options to ./configure as follows:
+add CFLAGS="--march=i686" and CXXFLAGS="-march=i686" options to ./configure as follows:
 
   $ ./configure CFLAGS="-march=i686" CXXFLAGS="-march=i686"
 ])