diff --git a/configure.ac b/configure.ac
index 2a3ed2c..f85db34 100644
--- a/configure.ac
+++ b/configure.ac
@@ -65,7 +65,8 @@
                              [(default is no)]),
               [case "${enableval}" in
                  yes)
-		   CFLAGS=$(CFLAGS) -m32
+                   CFLAGS="${CFLAGS} -m32"
+                   CXXFLAGS="${CXXFLAGS} -m32"
                    usem32=true
                    ;;
                  no)