diff --git a/decoder_test.go b/decoder_test.go
index ef39f6b..39ea046 100644
--- a/decoder_test.go
+++ b/decoder_test.go
@@ -350,6 +350,12 @@ func TestDecode_interface(t *testing.T) {
 				"default": `${replace("europe-west", "-", " ")}`,
 			},
 		},
+
+		{
+			"block_assign.hcl",
+			true,
+			nil,
+		},
 	}
 
 	for _, tc := range cases {
diff --git a/test-fixtures/block_assign.hcl b/test-fixtures/block_assign.hcl
new file mode 100644
index 0000000..ee8b06f
--- /dev/null
+++ b/test-fixtures/block_assign.hcl
@@ -0,0 +1,2 @@
+environment = "aws" {
+}