diff --git a/src/builder-cache.c b/src/builder-cache.c
index ce7247c7..3c96c7f9 100644
--- a/src/builder-cache.c
+++ b/src/builder-cache.c
@@ -1336,6 +1336,13 @@ builder_cache_checksum_uint32 (BuilderCache *self,
   g_checksum_update (self->checksum, v, 4);
 }
 
+void
+builder_cache_checksum_random (BuilderCache *self)
+{
+  builder_cache_checksum_uint32 (self, g_random_int ());
+  builder_cache_checksum_uint32 (self, g_random_int ());
+}
+
 void
 builder_cache_checksum_uint64 (BuilderCache *self,
                                guint64       val)
diff --git a/src/builder-cache.h b/src/builder-cache.h
index c45c2e0a..e7edce9f 100644
--- a/src/builder-cache.h
+++ b/src/builder-cache.h
@@ -80,6 +80,7 @@ void builder_cache_checksum_uint64 (BuilderCache *self,
 void builder_cache_checksum_data (BuilderCache *self,
                                   guint8       *data,
                                   gsize         len);
+void builder_cache_checksum_random (BuilderCache *self);
 
 G_DEFINE_AUTOPTR_CLEANUP_FUNC (BuilderCache, g_object_unref)