1 files changed, 1 insertions, 0 deletions
diff --git a/mem.c b/mem.c
index 2532234..1c0f121 100644
--- a/mem.c
+++ b/mem.c
@@ -241,6 +241,7 @@ imap_set_(struct imapbase *m, void **v, uint vsiz, short k)
 void
 pmap_init_(struct pmapbase *m, void **v, uint vsiz, uint N)
 {
+   assert(ispo2(N));
    uint sizk = N*sizeof*m->k,
         sizv = N*vsiz;