diff --git a/src/zeek.bif b/src/zeek.bif
index fceaa3ac5f..18a83c2ec2 100644
--- a/src/zeek.bif
+++ b/src/zeek.bif
@@ -2399,7 +2399,7 @@ function double_to_time%(d: double%): time
 ## .. zeek:see:: interval_to_double
 function double_to_interval%(d: double%): interval
 	%{
-	return make_intrusive<Val>(d, TYPE_INTERVAL);
+	return make_intrusive<IntervalVal>(d, Seconds);
 	%}
 
 ## Converts a :zeek:type:`port` to a :zeek:type:`count`.
diff --git a/testing/btest/Baseline/bifs.to_interval/out b/testing/btest/Baseline/bifs.to_interval/out
index d841f8d99a..df639fecfe 100644
--- a/testing/btest/Baseline/bifs.to_interval/out
+++ b/testing/btest/Baseline/bifs.to_interval/out
@@ -1,2 +1,3 @@
-1234563.14
--1234563.14
+interval, 14.0 days 6.0 hrs 56.0 mins 3.0 secs 139.0 msecs 999.999898 usecs
+interval, -14.0 days -6.0 hrs -56.0 mins -3.0 secs -139.0 msecs -999.999898 usecs
+interval, 6.0 secs
diff --git a/testing/btest/bifs/to_interval.zeek b/testing/btest/bifs/to_interval.zeek
index a9bab7b675..2e19e423f6 100644
--- a/testing/btest/bifs/to_interval.zeek
+++ b/testing/btest/bifs/to_interval.zeek
@@ -4,8 +4,10 @@
 
 event zeek_init()
 	{
-	local a = 1234563.14;
-	print double_to_interval(a);
-	local b = -1234563.14;
-	print double_to_interval(b);
+	local a = double_to_interval(1234563.140);
+	print type_name(a), a;
+	local b = double_to_interval(-1234563.14);
+	print type_name(b), b;
+	local c = double_to_interval(6.0);
+	print type_name(c), c;
 	}