diff --git a/configure.in b/configure.in
index 9ba69b70..c84c7996 100644
--- a/configure.in
+++ b/configure.in
@@ -271,10 +271,10 @@ AC_ARG_WITH(libpq,AC_HELP_STRING([--with-libpq=DIR],[use Postgress SQL from DIR
 if [[ "x$ac_cv_use_libpq" != "xno" ]]; then
 AC_MSG_CHECKING([for Postgress SQL in $ac_cv_use_libpq])
 local_lib="$ARCHLIB"
-libpq="$ac_cv_use_libpq/$ARCHLIB/libpq.so"
+libpq="$ac_cv_use_libpq/$local_lib/libpq.so"
 if [[ "x$local_lib" != "xlib" -a ! -f "$libpq" ]]; then
     local_lib="lib"
-    libpq="$ac_cv_use_libpq/$ARCHLIB/libpq.so"
+    libpq="$ac_cv_use_libpq/$local_lib/libpq.so"
 fi
 for i in include include/pgsql pgsql/include include/postgresql; do
     incpq="$ac_cv_use_libpq/$i"