diff --git a/opal/mca/memory/darwin/configure.m4 b/opal/mca/memory/darwin/configure.m4
index a4bb6069c5..b73bbd6608 100644
--- a/opal/mca/memory/darwin/configure.m4
+++ b/opal/mca/memory/darwin/configure.m4
@@ -66,7 +66,7 @@ AC_DEFUN([MCA_memory_darwin_CONFIG],[
 
     AS_IF([test "$memory_darwin_happy" = "yes"],
           [# Yes, we really do want to screw with LDFLAGS here...
-           LDFLAGS="$LDFLAGS -Wl,-multiply_defined,suppress"
+           LDFLAGS="$LDFLAGS -Wl,-u,_munmap -Wl,-multiply_defined,suppress"
            memory_darwin_WRAPPER_EXTRA_LDFLAGS="-Wl,-u,_munmap -Wl,-multiply_defined,suppress"
            $1], [$2])
 ])