diff --git a/src/prim/unix/prim.c b/src/prim/unix/prim.c
index f93e458a..f3ccb013 100644
--- a/src/prim/unix/prim.c
+++ b/src/prim/unix/prim.c
@@ -70,6 +70,7 @@ terms of the MIT license. A copy of the license can be found in the file
 #define MADV_FREE  POSIX_MADV_FREE
 #endif
 
+#define MI_UNIX_LARGE_PAGE_SIZE (2*MI_MiB) // TODO: can we query the OS for this?
 
 //------------------------------------------------------------------------------------
 // Use syscalls for some primitives to allow for libraries that override open/read/close etc.
@@ -156,7 +157,7 @@ void _mi_prim_mem_init( mi_os_mem_config_t* config )
     }
     #endif
   }
-  config->large_page_size = 2*MI_MiB; // TODO: can we query the OS for this?
+  config->large_page_size = MI_UNIX_LARGE_PAGE_SIZE;
   config->has_overcommit = unix_detect_overcommit();
   config->has_partial_free = true;    // mmap can free in parts
   config->has_virtual_reserve = true; // todo: check if this true for NetBSD?  (for anonymous mmap with PROT_NONE)
@@ -386,6 +387,9 @@ int _mi_prim_alloc(void* hint_addr, size_t size, size_t try_alignment, bool comm
   mi_assert_internal(size > 0 && (size % _mi_os_page_size()) == 0);
   mi_assert_internal(commit || !allow_large);
   mi_assert_internal(try_alignment > 0);
+  if (hint_addr == NULL && size >= 8*MI_UNIX_LARGE_PAGE_SIZE && try_alignment > 1 && _mi_is_power_of_two(try_alignment) && try_alignment < MI_UNIX_LARGE_PAGE_SIZE) {
+    try_alignment = MI_UNIX_LARGE_PAGE_SIZE; // try to align along large page size for larger allocations
+  }
 
   *is_zero = true;
   int protect_flags = (commit ? (PROT_WRITE | PROT_READ) : PROT_NONE);
@@ -433,7 +437,7 @@ int _mi_prim_decommit(void* start, size_t size, bool* needs_recommit) {
   int err = 0;
   // decommit: use MADV_DONTNEED as it decreases rss immediately (unlike MADV_FREE)
   err = unix_madvise(start, size, MADV_DONTNEED);
-  #if !MI_DEBUG && !MI_SECURE
+  #if !MI_DEBUG && MI_SECURE<=2
     *needs_recommit = false;
   #else
     *needs_recommit = true;