diff --git a/tests/lib/mem_alloc/prj_newlib.conf b/tests/lib/mem_alloc/prj_newlib.conf
index dabdfd5997038..edf093027c395 100644
--- a/tests/lib/mem_alloc/prj_newlib.conf
+++ b/tests/lib/mem_alloc/prj_newlib.conf
@@ -1,4 +1,5 @@
 CONFIG_ZTEST=y
 CONFIG_NEWLIB_LIBC=y
-CONFIG_NEWLIB_LIBC_ALIGNED_HEAP_SIZE=512
+CONFIG_NEWLIB_LIBC_NANO=n
+CONFIG_NEWLIB_LIBC_ALIGNED_HEAP_SIZE=8192
 CONFIG_TEST_USERSPACE=y