diff --git a/src/libsysprof/preload/sysprof-memory-collector.c b/src/libsysprof/preload/sysprof-memory-collector.c
index 6e1c6327..33b1d0ec 100644
--- a/src/libsysprof/preload/sysprof-memory-collector.c
+++ b/src/libsysprof/preload/sysprof-memory-collector.c
@@ -62,7 +62,7 @@ G_DEFINE_CONSTRUCTOR(collector_init_ctor)
 static void
 collector_init_ctor (void)
 {
-#if ENABLE_LIBUNWIND
+#ifdef 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