diff --git a/config/interpolate.go b/config/interpolate.go
index 77bc15117..0b0bfc460 100644
--- a/config/interpolate.go
+++ b/config/interpolate.go
@@ -196,7 +196,8 @@ func (i *VariableInterpolation) Interpolate(
 	v, ok := vs[i.key]
 	if !ok {
 		return "", fmt.Errorf(
-			"%s: value for variable '%s' not found", v)
+			"%s: value for variable not found",
+			i.key)
 	}
 
 	return v, nil
diff --git a/terraform/context_test.go b/terraform/context_test.go
index 1cf797c7e..9d161ea6b 100644
--- a/terraform/context_test.go
+++ b/terraform/context_test.go
@@ -1168,10 +1168,6 @@ func TestContextPlan_computed(t *testing.T) {
 		t.Fatalf("err: %s", err)
 	}
 
-	if len(plan.Diff.Resources) < 2 {
-		t.Fatalf("bad: %#v", plan.Diff.Resources)
-	}
-
 	actual := strings.TrimSpace(plan.String())
 	expected := strings.TrimSpace(testTerraformPlanComputedStr)
 	if actual != expected {
diff --git a/terraform/test-fixtures/apply-compute/main.tf b/terraform/test-fixtures/apply-compute/main.tf
index 3999b5912..8fe55ed17 100644
--- a/terraform/test-fixtures/apply-compute/main.tf
+++ b/terraform/test-fixtures/apply-compute/main.tf
@@ -1,3 +1,7 @@
+variable "value" {
+    default = ""
+}
+
 resource "aws_instance" "foo" {
     num = "2"
     compute = "dynamical"