diff --git a/tests/posix/fs/prj.conf b/tests/posix/fs/prj.conf
index da73481ef4d..7fb9ec9aed0 100644
--- a/tests/posix/fs/prj.conf
+++ b/tests/posix/fs/prj.conf
@@ -5,4 +5,5 @@ CONFIG_POSIX_API=y
 CONFIG_POSIX_FILE_SYSTEM=y
 CONFIG_ZTEST=y
 CONFIG_MAIN_STACK_SIZE=4096
+CONFIG_ZTEST_STACK_SIZE=2048
 CONFIG_EVENTFD=n