diff --git a/tests/regressions/test-big-heap.c b/tests/regressions/test-big-heap.c
index cd9c14419..1cbf8d23c 100644
--- a/tests/regressions/test-big-heap.c
+++ b/tests/regressions/test-big-heap.c
@@ -55,11 +55,11 @@ main (int argc, char *argv[])
    * contiguous memory.  Therefore skip the test if the calloc call
    * fails.
    */
-  /* XXX This test also fails for machines with ~ 4 GB of RAM,
-   * because the 2 GB allocation succeeds here, but the fork
-   * fails (since it will require around 2 * 2 GB).
+  /* XXX This test also fails for machines with ~ 2 GB of RAM,
+   * because the 1.1 GB allocation succeeds here, but the fork
+   * fails (since it will require around 2 * 1.1 GB).
    */
-  mem = calloc (2 * 1024, 1024 * 1024);
+  mem = calloc (1100, 1024 * 1024);
   if (mem == NULL) {
     fprintf (stderr,
              "%s: test skipped because cannot allocate enough "