diff --git a/configure.in b/configure.in
index b88c06ef47..d144244195 100644
--- a/configure.in
+++ b/configure.in
@@ -1515,9 +1515,9 @@ dnl ------------------------------------------------------------------------
 dnl Platform specific tests
 dnl ------------------------------------------------------------------------
 
-dnl xlC needs -qunique (at least on AIX) so that one source file can be
+dnl xlC needs -qunique under AIX so that one source file can be
 dnl compiled to multiple object files and safely linked together.
-if test "x$XLCXX" = "xyes"; then
+if test "x$XLCXX" = "xyes" -a "x$USE_AIX" = "x1"; then
     CXXFLAGS="$CXXFLAGS -qunique"
 fi