diff --git a/srcpkgs/rng-tools/template b/srcpkgs/rng-tools/template
index 64d03069581..adbb8b0b251 100644
--- a/srcpkgs/rng-tools/template
+++ b/srcpkgs/rng-tools/template
@@ -13,6 +13,7 @@ license="GPL-2.0-or-later"
 homepage="https://github.com/nhorman/rng-tools"
 distfiles="https://github.com/nhorman/rng-tools/archive/v${version}.tar.gz"
 checksum=bff0c58dff90ec10bd61f672e48618e045155eabd60b32d63a9c4ffbdad05f3a
+CFLAGS=-DJENT_CONF_ENABLE_INTERNAL_TIMER
 
 case "$XBPS_TARGET_MACHINE" in
 	*-musl)	makedepends+=" argp-standalone" ;;