diff --git a/lib/config/defaults.h b/lib/config/defaults.h
index 05747fa93..51542df9c 100644
--- a/lib/config/defaults.h
+++ b/lib/config/defaults.h
@@ -104,7 +104,7 @@
 #define DEFAULT_THIN_REPAIR_OPTION1 ""
 #define DEFAULT_THIN_REPAIR_OPTIONS_CONFIG "#S" DEFAULT_THIN_REPAIR_OPTION1
 #define DEFAULT_THIN_POOL_METADATA_REQUIRE_SEPARATE_PVS 0
-#define DEFAULT_THIN_POOL_MAX_METADATA_SIZE (16 * 1024 * 1024)  /* KB */
+#define DEFAULT_THIN_POOL_MAX_METADATA_SIZE (DM_THIN_MAX_METADATA_SIZE / 2)  /* KB */
 #define DEFAULT_THIN_POOL_MIN_METADATA_SIZE 2048  /* KB */
 #define DEFAULT_THIN_POOL_OPTIMAL_METADATA_SIZE (128 * 1024 * 1024) /* KB */
 #define DEFAULT_THIN_POOL_CHUNK_SIZE_POLICY "generic"