diff --git a/src/vlib/linux/physmem.c b/src/vlib/linux/physmem.c
index 3cc42a0..6d3f7c5 100644
--- a/src/vlib/linux/physmem.c
+++ b/src/vlib/linux/physmem.c
@@ -157,7 +157,7 @@
   pr->mem = alloc.addr;
   pr->log2_page_size = alloc.log2_page_size;
   pr->n_pages = alloc.n_pages;
-  pr->size = pr->n_pages << pr->log2_page_size;
+  pr->size = (u64) pr->n_pages << (u64) pr->log2_page_size;
   pr->page_mask = (1 << pr->log2_page_size) - 1;
   pr->numa_node = numa_node;
   pr->name = format (0, "%s", name);