diff --git a/tests/malloc_thread_safety/Makefile.ci b/tests/malloc_thread_safety/Makefile.ci
index 69c36480c6..b5de876337 100644
--- a/tests/malloc_thread_safety/Makefile.ci
+++ b/tests/malloc_thread_safety/Makefile.ci
@@ -1,5 +1,6 @@
 BOARD_INSUFFICIENT_MEMORY := \
     arduino-duemilanove \
+    arduino-leonardo \
     arduino-nano \
     arduino-uno \
     atmega328p \