diff --git a/tests/src/lv_test_conf_full.h b/tests/src/lv_test_conf_full.h
index af01d7944..91b631fc9 100644
--- a/tests/src/lv_test_conf_full.h
+++ b/tests/src/lv_test_conf_full.h
@@ -57,6 +57,7 @@
 
 #define LV_USE_FS_STDIO     1
 #define LV_FS_STDIO_LETTER  'A'
+#define LV_FS_STDIO_CACHE_SIZE 512
 #define LV_USE_FS_POSIX     1
 #define LV_FS_POSIX_LETTER  'B'