diff --git a/src/builder-cache.c b/src/builder-cache.c
index 6ee254f2..fc5e59c1 100644
--- a/src/builder-cache.c
+++ b/src/builder-cache.c
@@ -1237,6 +1237,24 @@ builder_cache_checksum_uint32 (BuilderCache *self,
   g_checksum_update (self->checksum, v, 4);
 }
 
+void
+builder_cache_checksum_uint64 (BuilderCache *self,
+                               guint64       val)
+{
+  guchar v[8];
+
+  v[0] = (val >> 0) & 0xff;
+  v[1] = (val >> 8) & 0xff;
+  v[2] = (val >> 16) & 0xff;
+  v[3] = (val >> 24) & 0xff;
+  v[4] = (val >> 32) & 0xff;
+  v[5] = (val >> 40) & 0xff;
+  v[6] = (val >> 48) & 0xff;
+  v[7] = (val >> 56) & 0xff;
+
+  g_checksum_update (self->checksum, v, 8);
+}
+
 void
 builder_cache_checksum_data (BuilderCache *self,
                              guint8       *data,
diff --git a/src/builder-cache.h b/src/builder-cache.h
index 5c4e54d7..c45c2e0a 100644
--- a/src/builder-cache.h
+++ b/src/builder-cache.h
@@ -75,6 +75,8 @@ void builder_cache_checksum_compat_boolean (BuilderCache *self,
                                             gboolean      val);
 void builder_cache_checksum_uint32 (BuilderCache *self,
                                     guint32       val);
+void builder_cache_checksum_uint64 (BuilderCache *self,
+                                    guint64       val);
 void builder_cache_checksum_data (BuilderCache *self,
                                   guint8       *data,
                                   gsize         len);