diff --git a/test/test_fmm.py b/test/test_fmm.py
index 62210e6a066591f51a13e2e6455e8032d5d41a46..0d8f36d81979de64103c50f29ac21ecc46625abf 100644
--- a/test/test_fmm.py
+++ b/test/test_fmm.py
@@ -111,8 +111,8 @@ def test_sumpy_fmm(ctx_getter, knl, local_expn_class, mpole_expn_class):
     ctx = ctx_getter()
     queue = cl.CommandQueue(ctx)
 
-    nsources = 500
-    ntargets = 50
+    nsources = 1000
+    ntargets = 300
     dtype = np.float64
 
     from boxtree.tools import (