diff --git a/proxyface.spec.in b/proxyface.spec.in
index aef125b..662e6a9 100644
--- a/proxyface.spec.in
+++ b/proxyface.spec.in
@@ -27,7 +27,8 @@ function checkqt() {
 }
 MOC="$(checkqt moc)" UIC="$(checkqt uic)" RCC="$(checkqt rcc)" \
     LUPDATE="$(checkqt lupdate)" LRELEASE="$(checkqt lrelease)" \
-    CPPFLAGS="-std=c++0x -I/usr/include/PCSC -I/usr/include/pkcs11-helper-1.0" \
+    CXXFLAGS="-std=c++0x" \
+    CPPFLAGS="-I/usr/include/PCSC -I/usr/include/pkcs11-helper-1.0" \
     ./configure --prefix=/usr \
                 --docdir=/usr/share/doc/packages/@PACKAGENAME@ \
                 --libdir=/usr/%_lib