diff --git a/configure.ac b/configure.ac
index dfd997b00..abc1c31c6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -194,6 +194,7 @@ AC_PREPROC_IFELSE(
 	[AC_MSG_RESULT([no])])
 
 AC_C_FLAG([-Wall])
+AC_C_FLAG([-O2])
 AC_C_FLAG([-Wextra],[AC_C_FLAG([-W])])
 AC_C_FLAG([-Wno-unused-parameter])
 AC_C_FLAG([-std=gnu99])
@@ -201,6 +202,7 @@ AC_CXX_FLAG([-Wall])
 AC_CXX_FLAG([-Wextra],[AC_CXX_FLAG([-W])])
 AC_CXX_FLAG([-Wno-unused-parameter])
 AC_CXX_FLAG([-Wno-long-long])
+AC_CXX_FLAG([-O2])
 AC_CXX_FLAG([-fpermissive])
 AC_CXX_FLAG([-fno-strict-aliasing])
 AC_CXX_FLAG([-std=c++98])