diff --git a/tests/legacy/kernel/test_errno/src/main.c b/tests/legacy/kernel/test_errno/src/main.c
index 41b88276187..46633392fc3 100644
--- a/tests/legacy/kernel/test_errno/src/main.c
+++ b/tests/legacy/kernel/test_errno/src/main.c
@@ -20,7 +20,7 @@
 
 #define N_FIBERS 2
 
-#define STACK_SIZE 256
+#define STACK_SIZE 384
 static __stack char stacks[N_FIBERS][STACK_SIZE];
 
 static int errno_values[N_FIBERS + 1] = {