diff --git a/configure.ac b/configure.ac
index 98c7270..52fc41e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -122,7 +122,6 @@ AC_SUBST(LIBTOOL_DEPS)
 
 # C++
 AC_LANG(C++)
-AC_CXX_OPTIMIZE
 
 # Only nsdejavu needs libtool.
 # But some combinations of libtool and autoconf