diff --git a/spec/fixtures/input_ucl_invalid.conf b/spec/fixtures/input_ucl_invalid.conf
new file mode 100644
index 0000000..1d869b6
--- /dev/null
+++ b/spec/fixtures/input_ucl_invalid.conf
@@ -0,0 +1,7 @@
+string: "bar,
+true = true
+false = false
+nil: null
+integer 1864
+double 23.42
+time: 10s
diff --git a/spec/ucl/decoder_spec.cr b/spec/ucl/decoder_spec.cr
index d2aab87..b7c9d1d 100644
--- a/spec/ucl/decoder_spec.cr
+++ b/spec/ucl/decoder_spec.cr
@@ -70,5 +70,12 @@ describe UCL::Decoder do
       input_ucl_conf = File.read("spec/fixtures/input_ucl.conf")
       UCL::Decoder.decode(input_ucl_conf).should eq(OUTPUT_OBJECT)
     end
+
+    it "should raise error on invalid UCL conf" do
+      input_ucl_conf = File.read("spec/fixtures/input_ucl_invalid.conf")
+      expect_raises(UCL::Error::DecoderError) do
+        UCL::Decoder.decode(input_ucl_conf)
+      end
+    end
   end
 end