diff --git a/tests/kernel/threads/thread_apis/prj.conf b/tests/kernel/threads/thread_apis/prj.conf
index 68e030211e7..bf192b9247c 100644
--- a/tests/kernel/threads/thread_apis/prj.conf
+++ b/tests/kernel/threads/thread_apis/prj.conf
@@ -3,7 +3,6 @@ CONFIG_THREAD_MONITOR=y
 CONFIG_THREAD_CUSTOM_DATA=y
 CONFIG_THREAD_NAME=y
 CONFIG_THREAD_STACK_INFO=y
-CONFIG_HEAP_MEM_POOL_SIZE=256
 CONFIG_SCHED_CPU_MASK=y
 CONFIG_TEST_USERSPACE=y
 CONFIG_MP_MAX_NUM_CPUS=1
diff --git a/tests/kernel/threads/thread_error_case/prj.conf b/tests/kernel/threads/thread_error_case/prj.conf
index 292c830bc05..f8f0ab6176a 100644
--- a/tests/kernel/threads/thread_error_case/prj.conf
+++ b/tests/kernel/threads/thread_error_case/prj.conf
@@ -3,7 +3,6 @@ CONFIG_THREAD_MONITOR=y
 CONFIG_THREAD_CUSTOM_DATA=y
 CONFIG_THREAD_NAME=y
 CONFIG_THREAD_STACK_INFO=y
-CONFIG_HEAP_MEM_POOL_SIZE=256
 CONFIG_SCHED_CPU_MASK=y
 CONFIG_TEST_USERSPACE=y
 CONFIG_MP_MAX_NUM_CPUS=1