diff --git a/test/translate.ts b/test/translate.ts
index 44697c19..5e8934f4 100644
--- a/test/translate.ts
+++ b/test/translate.ts
@@ -21,6 +21,7 @@ tape('Version string to Semver translator', function (t) {
   t.test('Broken nightly with leading zeroes', function (st) {
     st.equal(versionToSemver('0.3.6-nightly.2016.08.27+commit.91d4fa47.Emscripten.clang'), '0.3.6-nightly.2016.8.27+commit.91d4fa47.Emscripten.clang');
     st.equal(versionToSemver('0.4.1-nightly.2016.09.09+commit.79867f49.Emscripten.clang'), '0.4.1-nightly.2016.9.9+commit.79867f49.Emscripten.clang');
+    st.equal(versionToSemver('0.4.1-nightly.2016.12.06+commit.79867f49.Emscripten.clang'), '0.4.1-nightly.2016.12.6+commit.79867f49.Emscripten.clang');
     st.end();
   });
   t.test('Old style 0.1.1', function (st) {
diff --git a/translate.ts b/translate.ts
index 54df9ae0..551817f2 100644
--- a/translate.ts
+++ b/translate.ts
@@ -30,7 +30,8 @@ function versionToSemver (version) {
     return '0.3.5';
   }
   // This parses the obsolete nightly style where the date can have leading zeroes.
-  const nightlyParsed = version.match(/^([0-9]+\.[0-9]+\.[0-9]+)-nightly\.([0-9]+)\.0?([1-9])\.0?([1-9])(.*)$/);
+  // It does not validate the dates, but only if the date format is correct (i.e. YYYY.[M]M.[D]D).
+  const nightlyParsed = version.match(/^([0-9]+\.[0-9]+\.[0-9]+)-nightly\.([0-9]+)\.0?([1-9]+)\.0?([1-9]+)(.*)$/);
   if (nightlyParsed) {
     return nightlyParsed[1] + '-nightly.' + nightlyParsed[2] + '.' + nightlyParsed[3] + '.' + nightlyParsed[4] + nightlyParsed[5];
   }