diff --git a/tensorflow_probability/python/distributions/platform_compatibility_test.py b/tensorflow_probability/python/distributions/platform_compatibility_test.py
index 23eb4e4f80..d6669b2c21 100644
--- a/tensorflow_probability/python/distributions/platform_compatibility_test.py
+++ b/tensorflow_probability/python/distributions/platform_compatibility_test.py
@@ -227,6 +227,7 @@
 
 COMPOSITE_TENSOR_LOGPROB_RTOL = collections.defaultdict(lambda: 1e-6)
 COMPOSITE_TENSOR_LOGPROB_RTOL.update({
+    'GammaGamma': 1e-5,
     'WishartTriL': 1e-5,
 })