diff --git a/SIP.js/index.d.ts b/sip.js/index.d.ts
similarity index 100%
rename from SIP.js/index.d.ts
rename to sip.js/index.d.ts
diff --git a/SIP.js/SIP.js-tests.ts b/sip.js/sip.js-tests.ts
similarity index 100%
rename from SIP.js/SIP.js-tests.ts
rename to sip.js/sip.js-tests.ts
diff --git a/SIP.js/tsconfig.json b/sip.js/tsconfig.json
similarity index 94%
rename from SIP.js/tsconfig.json
rename to sip.js/tsconfig.json
index 93cce57ffb..8c84c6273e 100644
--- a/SIP.js/tsconfig.json
+++ b/sip.js/tsconfig.json
@@ -18,6 +18,6 @@
     },
     "files": [
         "index.d.ts",
-        "SIP.js-tests.ts"
+        "sip.js-tests.ts"
     ]
 }
diff --git a/SIP.js/tslint.json b/sip.js/tslint.json
similarity index 100%
rename from SIP.js/tslint.json
rename to sip.js/tslint.json