diff --git a/c/src/lib/libbsp/sh/shsim/make/custom/simsh1-testsuite.tcfg b/c/src/lib/libbsp/sh/shsim/make/custom/simsh1-testsuite.tcfg
index b83b7ee208..542f689e34 100644
--- a/c/src/lib/libbsp/sh/shsim/make/custom/simsh1-testsuite.tcfg
+++ b/c/src/lib/libbsp/sh/shsim/make/custom/simsh1-testsuite.tcfg
@@ -7,6 +7,7 @@
 include: testdata/require-tick-isr.tcfg
 include: testdata/disable-intrcritical-tests.tcfg
 
+fileio
 fsdosfsname01
 iostream
 utf8proc01