diff --git a/project/config/cfgdefs.sh b/project/config/cfgdefs.sh
index 750de3a..a94a143 100644
--- a/project/config/cfgdefs.sh
+++ b/project/config/cfgdefs.sh
@@ -105,6 +105,15 @@ cfgdefs_perform_common_tests()
 	mb_cfgtest_headers='sys/sendfile.h'
 	cfgtest_interface_presence 'sendfile'
 
+	# getrandom: easier to simply test,
+	# than to test whether we need to test
+	# (and then test).
+	mb_cfgtest_headers='sys/syscall.h'
+
+	if cfgtest_decl_presence 'SYS_getrandom'; then
+		cfgtest_cflags_append '-DHAVE_GETRANDOM_SYSCALL'
+	fi
+
 	# ncurses: python refers to members of typedef struct _win_st WINDOW
 	cfgtest_cflags_append '-DNCURSES_INTERNALS'