diff --git a/test/libwhisper/bloomFilter.cpp b/test/libwhisper/bloomFilter.cpp
index 386be2f6b..10e34df2d 100644
--- a/test/libwhisper/bloomFilter.cpp
+++ b/test/libwhisper/bloomFilter.cpp
@@ -244,7 +244,7 @@ BOOST_AUTO_TEST_CASE(bloomFilterRaw)
 	BOOST_REQUIRE(!f.contains(b00110111));
 }
 
-enum { DistributionTestSize = 8 };
+static unsigned const DistributionTestSize = 8;
 
 void updateDistribution(FixedHash<DistributionTestSize> const& _h, unsigned* _distribution)
 {