diff --git a/configure.ac b/configure.ac
index 98d55a18..59d956b4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -467,7 +467,7 @@ AS_CASE(["$ARG_ENABLE_SSE2"],
   ["yes"|"on"], [
       AC_MSG_RESULT([yes])
       AC_DEFINE([USE_SSE2],[1],[Enable SSE2])
-      COMPILETIME_OPTIONS="$COMPILETIME_OPTIONS -DUSE_SSE2 -msse2 "
+      CXXFLAGS="$CXXFLAGS -DUSE_SSE2 -msse2 "
     ],
   ["no"|"off"], [
       AC_MSG_RESULT([no])