diff --git a/source/dub/generators/generator.d b/source/dub/generators/generator.d
index 5cdfc04..250441c 100644
--- a/source/dub/generators/generator.d
+++ b/source/dub/generators/generator.d
@@ -492,6 +492,7 @@
 	foreach (dep; proj.dependencies)
 		PackagesUsed.add(dep.name);
 	PackagesUsed.store(env);
+	PackagesUsed.load(); // Refresh internal list from actual current environment
 	
 	runCommands(commands, env);
 }
diff --git a/source/dub/package_.d b/source/dub/package_.d
index 4eff271..ce00e08 100644
--- a/source/dub/package_.d
+++ b/source/dub/package_.d
@@ -669,16 +669,17 @@
 	}
 	
 	// Load from envvar
-	private static void load()
+	static void load()
 	{
 		auto commaList = environment.get(envVarName);
 		loaded = true;
 
+		packageNames = null;
 		foreach (name; commaList.split(","))
 			add(name);
 	}
 
-	// Load if not already loaded
+	// Load from envar if not already loaded
 	private static void ensureLoaded()
 	{
 		if (!loaded)