diff --git a/src/libsysprof-analyze/sysprof-document-allocation.c b/src/libsysprof-analyze/sysprof-document-allocation.c
index da7a73af..8a24238c 100644
--- a/src/libsysprof-analyze/sysprof-document-allocation.c
+++ b/src/libsysprof-analyze/sysprof-document-allocation.c
@@ -36,6 +36,7 @@ struct _SysprofDocumentAllocationClass
 enum {
   PROP_0,
   PROP_ADDRESS,
+  PROP_IS_FREE,
   PROP_SIZE,
   PROP_TID,
   N_PROPS
@@ -59,6 +60,10 @@ sysprof_document_allocation_get_property (GObject    *object,
       g_value_set_uint64 (value, sysprof_document_allocation_get_address (self));
       break;
 
+    case PROP_IS_FREE:
+      g_value_set_boolean (value, sysprof_document_allocation_is_free (self));
+      break;
+
     case PROP_SIZE:
       g_value_set_int64 (value, sysprof_document_allocation_get_size (self));
       break;
@@ -115,6 +120,11 @@ sysprof_document_allocation_class_init (SysprofDocumentAllocationClass *klass)
                         G_MININT64, G_MAXINT64, 0,
                         (G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
 
+  properties [PROP_IS_FREE] =
+    g_param_spec_boolean ("is-free", NULL, NULL,
+                          FALSE,
+                         (G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
+
   g_object_class_install_properties (object_class, N_PROPS, properties);
 }