diff --git a/demos/benchmark/lv_demo_benchmark.c b/demos/benchmark/lv_demo_benchmark.c
index a7e9f16f93..f28cbe20a0 100644
--- a/demos/benchmark/lv_demo_benchmark.c
+++ b/demos/benchmark/lv_demo_benchmark.c
@@ -22,6 +22,10 @@
     #error "LV_USE_DEMO_WIDGETS needs to be enabled"
 #endif
 
+#if LV_USE_STDLIB_MALLOC == LV_STDLIB_BUILTIN && LV_MEM_SIZE < 128 * 1024
+    #warning "It's recommended to have at least 128kB RAM for the benchmark"
+#endif
+
 #include "../../src/display/lv_display_private.h"
 #include "../../src/core/lv_global.h"