diff --git a/builder/builder-module.c b/builder/builder-module.c
index 4520486d6..f7e670834 100644
--- a/builder/builder-module.c
+++ b/builder/builder-module.c
@@ -1652,6 +1652,7 @@ builder_module_checksum (BuilderModule  *self,
   builder_cache_checksum_boolean (cache, self->cmake);
   builder_cache_checksum_boolean (cache, self->builddir);
   builder_cache_checksum_compat_strv (cache, self->build_commands);
+  builder_cache_checksum_compat_str (cache, self->buildsystem);
 
   if (self->build_options)
     builder_options_checksum (self->build_options, cache, context);