diff --git a/tests/posix/getopt/boards/hifive1.conf b/tests/posix/getopt/boards/hifive1.conf
index 5b4a7d3fc15..9c6cd44a398 100644
--- a/tests/posix/getopt/boards/hifive1.conf
+++ b/tests/posix/getopt/boards/hifive1.conf
@@ -1 +1 @@
-CONFIG_NEWLIB_LIBC_MIN_REQUIRED_HEAP_SIZE=2048
+CONFIG_NEWLIB_LIBC_MIN_REQUIRED_HEAP_SIZE=1024