diff --git a/tests/micropython/heapalloc.py b/tests/micropython/heapalloc.py
index 62f26df6a..f74bb92c8 100644
--- a/tests/micropython/heapalloc.py
+++ b/tests/micropython/heapalloc.py
@@ -2,6 +2,15 @@
 
 import micropython
 
+# Check for stackless build, which can't call functions without
+# allocating a frame on heap.
+try:
+    def stackless(): pass
+    micropython.heap_lock(); stackless(); micropython.heap_unlock()
+except RuntimeError:
+    print("SKIP")
+    raise SystemExit
+
 def f1(a):
     print(a)
 
diff --git a/tests/micropython/heapalloc_super.py b/tests/micropython/heapalloc_super.py
index 1cf5293d2..a8c23393e 100644
--- a/tests/micropython/heapalloc_super.py
+++ b/tests/micropython/heapalloc_super.py
@@ -1,6 +1,15 @@
 # test super() operations which don't require allocation
 import micropython
 
+# Check for stackless build, which can't call functions without
+# allocating a frame on heap.
+try:
+    def stackless(): pass
+    micropython.heap_lock(); stackless(); micropython.heap_unlock()
+except RuntimeError:
+    print("SKIP")
+    raise SystemExit
+
 class A:
     def foo(self):
         print('A foo')