diff --git a/src/share/vm/gc_implementation/parallelScavenge/generationSizer.cpp b/src/share/vm/gc_implementation/parallelScavenge/generationSizer.cpp
index 638460524ebd695a8ca414aea85ebfda340a0010..e417cd4959962d1df3a2ec2e1d0da820305fd7ea 100644
--- a/src/share/vm/gc_implementation/parallelScavenge/generationSizer.cpp
+++ b/src/share/vm/gc_implementation/parallelScavenge/generationSizer.cpp
@@ -75,6 +75,7 @@ void GenerationSizer::initialize_size_info() {
   size_t new_alignment = round_to(page_sz, _gen_alignment);
   if (new_alignment != _gen_alignment) {
     _gen_alignment = new_alignment;
+    _space_alignment = new_alignment;
     // Redo everything from the start
     initialize_flags();
   }