diff --git a/project/config/cfgdefs.sh b/project/config/cfgdefs.sh
index b32129a..583b8ab 100644
--- a/project/config/cfgdefs.sh
+++ b/project/config/cfgdefs.sh
@@ -148,6 +148,7 @@ cfgdefs_perform_common_tests()
 	# headers
 	cfgtest_header_absence  'stropts.h'
 	cfgtest_header_presence 'stdatomic.h'
+	cfgtest_header_presence 'crypt.h'
 	cfgtest_header_presence 'endian.h'
 	cfgtest_header_presence 'net/if.h'
 	cfgtest_header_presence 'sched.h'