diff --git a/config/interpolate_walk.go b/config/interpolate_walk.go
index b867deaf2..83c7baa86 100644
--- a/config/interpolate_walk.go
+++ b/config/interpolate_walk.go
@@ -12,7 +12,7 @@ import (
 // InterpSplitDelim is the delimeter that is looked for to split when
 // it is returned. This is a comma right now but should eventually become
 // a value that a user is very unlikely to use (such as UUID).
-const InterpSplitDelim = `,`
+const InterpSplitDelim = `B780FFEC-B661-4EB8-9236-A01737AD98B6`
 
 // interpRegexp is a regexp that matches interpolations such as ${foo.bar}
 var interpRegexp *regexp.Regexp = regexp.MustCompile(
diff --git a/terraform/test-fixtures/apply-output-multi/main.tf b/terraform/test-fixtures/apply-output-multi/main.tf
index ba9aa7e64..a70e334b1 100644
--- a/terraform/test-fixtures/apply-output-multi/main.tf
+++ b/terraform/test-fixtures/apply-output-multi/main.tf
@@ -8,5 +8,5 @@ resource "aws_instance" "bar" {
 }
 
 output "foo_num" {
-    value = "${aws_instance.bar.*.foo}"
+    value = "${join(",", aws_instance.bar.*.foo)}"
 }
diff --git a/terraform/test-fixtures/plan-count-var/main.tf b/terraform/test-fixtures/plan-count-var/main.tf
index f64b9655b..b4cf08fb1 100644
--- a/terraform/test-fixtures/plan-count-var/main.tf
+++ b/terraform/test-fixtures/plan-count-var/main.tf
@@ -6,5 +6,5 @@ resource "aws_instance" "foo" {
 }
 
 resource "aws_instance" "bar" {
-    foo = "${aws_instance.foo.*.foo}"
+    foo = "${join(",", aws_instance.foo.*.foo)}"
 }
diff --git a/terraform/test-fixtures/plan-count/main.tf b/terraform/test-fixtures/plan-count/main.tf
index 7cf29a208..276670ce4 100644
--- a/terraform/test-fixtures/plan-count/main.tf
+++ b/terraform/test-fixtures/plan-count/main.tf
@@ -4,5 +4,5 @@ resource "aws_instance" "foo" {
 }
 
 resource "aws_instance" "bar" {
-    foo = "${aws_instance.foo.*.foo}"
+    foo = "${join(",", aws_instance.foo.*.foo)}"
 }