diff --git a/configure.in b/configure.in
index 367aa61f04..62ca7b860b 100644
--- a/configure.in
+++ b/configure.in
@@ -138,6 +138,8 @@ if test "x${ax_cv_c_compiler_vendor}"  =  "xsun" ; then
     APR_ADDTO(SWITCH_AM_LDFLAGS, -R${prefix}/lib)
     if test "${enable_64}" = "yes"; then
         APR_ADDTO(SWITCH_AM_CFLAGS, -m64)
+        APR_ADDTO(SWITCH_AM_CXXFLAGS, -m64)
+        APR_ADDTO(SWITCH_AM_LDFLAGS, -m64)
     fi
 elif test "x${ax_cv_c_compiler_vendor}" = "xgnu" ; then
     APR_ADDTO(SWITCH_AM_CFLAGS, -fPIC)