diff --git a/src/libsysprof/preload/sysprof-memory-collector.c b/src/libsysprof/preload/sysprof-memory-collector.c
index 232c9dd7..27b8b40d 100644
--- a/src/libsysprof/preload/sysprof-memory-collector.c
+++ b/src/libsysprof/preload/sysprof-memory-collector.c
@@ -64,6 +64,7 @@ collector_init_ctor (void)
 {
 #if ENABLE_LIBUNWIND
   unw_set_caching_policy (unw_local_addr_space, UNW_CACHE_PER_THREAD);
+  unw_set_cache_size (unw_local_addr_space, 1024, 0);
 #endif
   sysprof_collector_init ();
   collector_ready = TRUE;