diff --git a/configure.in b/configure.in
index bdcc99025c..2cdd7e3376 100644
--- a/configure.in
+++ b/configure.in
@@ -532,12 +532,11 @@ AC_ARG_ENABLE( hbci,
   if test "x$enableval" != "xno" ; then
     HBCI_DIR=hbci
   fi)
-AC_PROG_CXX
 if test x${HBCI_DIR} = xhbci ;
 then
     AM_PATH_OPENHBCI(0.9.6)
     HBCI_LIBS="${OPENHBCI_LIBS}"
-    HBCI_CFLAGS="${OPENHBCI_CXXFLAGS}"
+    HBCI_CFLAGS="${OPENHBCI_CFLAGS}"
 
     AS_SCRUB_INCLUDE(HBCI_CFLAGS)
     AC_SUBST(HBCI_LIBS)