diff --git a/src/chunk.c b/src/chunk.c
index 79264527..b9a24416 100644
--- a/src/chunk.c
+++ b/src/chunk.c
@@ -254,7 +254,9 @@ chunk_alloc_default(void *new_addr, size_t size, size_t alignment, bool *zero,
 {
 	arena_t *arena;
 
-	arena = arena_get(tsd_fetch(), arena_ind, false, true);
+	/* Dodge tsd for a0 in order to avoid bootstrapping issues. */
+	arena = (arena_ind == 0) ? a0get() : arena_get(tsd_fetch(), arena_ind,
+	     false, true);
 	/*
 	 * The arena we're allocating on behalf of must have been initialized
 	 * already.