diff --git a/source/dub/packagemanager.d b/source/dub/packagemanager.d
index 0f78316..f20bea9 100644
--- a/source/dub/packagemanager.d
+++ b/source/dub/packagemanager.d
@@ -250,6 +250,7 @@
 
 		// overwrite package.json (this one includes a version field)
 		Json pi = jsonFromFile(destination~PackageJsonFilename);
+		pi["name"] = toLower(pi["name"].get!string());
 		pi["version"] = package_info["version"];
 		writeJsonFile(destination~PackageJsonFilename, pi);
 
diff --git a/source/dub/project.d b/source/dub/project.d
index 3fa0b94..31877cc 100644
--- a/source/dub/project.d
+++ b/source/dub/project.d
@@ -166,6 +166,10 @@
 
 		m_main = new Package(InstallLocation.local, m_root);
 		m_main.warnOnSpecialCompilerFlags();
+		if (m_main.name != m_main.name.toLower()) {
+			logWarn("Package names should always be lower case, please change from '%s' to '%s'!",
+				m_main.name, m_main.name.toLower());
+		}
 
 		// TODO: compute the set of mutual dependencies first
 		// (i.e. ">=0.0.1 <=0.0.5" and "<= 0.0.4" get ">=0.0.1 <=0.0.4")