diff --git a/ports/stm8/tests-main.c b/ports/stm8/tests-main.c
index 7981a19..fce52e8 100644
--- a/ports/stm8/tests-main.c
+++ b/ports/stm8/tests-main.c
@@ -78,7 +78,7 @@
  * future as the codebase changes but for the time being is enough to
  * cope with all of the automated tests.
  */
-#define MAIN_STACK_SIZE_BYTES       256
+#define MAIN_STACK_SIZE_BYTES       384
 
 
 /*