diff --git a/scripts/base/init-bare.bro b/scripts/base/init-bare.bro
index 3a5b2023dd..4637580337 100644
--- a/scripts/base/init-bare.bro
+++ b/scripts/base/init-bare.bro
@@ -1489,7 +1489,7 @@ module Threading;
 export {
 	## The heart beat interval used by the threading framework.
 	## Changing this should usually not be neccessary and will break several tests.
-	const heart_beat_interval = 1.0 &redef;
+	const heart_beat_interval = 1.0 secs &redef;
 }
 
 module GLOBAL;
diff --git a/src/const.bif b/src/const.bif
index aadb1e1ab7..f9e5f61644 100644
--- a/src/const.bif
+++ b/src/const.bif
@@ -12,4 +12,4 @@ const NFS3::return_data: bool;
 const NFS3::return_data_max: count;
 const NFS3::return_data_first_only: bool;
 
-const Threading::heart_beat_interval: double;
+const Threading::heart_beat_interval: interval;