diff --git a/package.cm b/package.cm
index 1421032a..f7371a1f 100644
--- a/package.cm
+++ b/package.cm
@@ -245,11 +245,18 @@ package.list_modules = function(name) {
   var files = package.list_files(name)
   var modules = []
   var i = 0
+  var stem = null
   for (i = 0; i < length(files); i++) {
     if (ends_with(files[i], '.cm')) {
       push(modules, text(files[i], 0, -3))
     }
   }
+  var c_files = package.get_c_files(name, null, true)
+  for (i = 0; i < length(c_files); i++) {
+    stem = ends_with(c_files[i], '.cpp') ? text(c_files[i], 0, -4) : text(c_files[i], 0, -2)
+    if (find(modules, function(m) { return m == stem }) == null)
+      push(modules, stem)
+  }
   return modules
 }