diff --git a/tests/test-region.c b/tests/test-region.c
index 4e0947e..2effc99 100644
--- a/tests/test-region.c
+++ b/tests/test-region.c
@@ -73,7 +73,7 @@ static void rect_set(SpiceRect *r, int32_t top, int32_t left, int32_t bottom, in
     r->left = left;
     r->bottom = bottom;
     r->right = right;
-    spice_assert(rect_is_valid(r));
+    g_assert_true(rect_is_valid(r));
 }
 
 static void random_region(QRegion *reg)