diff --git a/src/wallet/walletdb.cpp b/src/wallet/walletdb.cpp
index abac194ba..31e83e4b5 100644
--- a/src/wallet/walletdb.cpp
+++ b/src/wallet/walletdb.cpp
@@ -34,6 +34,15 @@
 #include <boost/scoped_ptr.hpp>
 #include <boost/thread.hpp>
 
+// Out-of-line definitions for CHDChain's in-class static constants. These are
+// only initialised in the class body, so any ODR use -- binding one to a const
+// reference, which is exactly what gtest's EXPECT_*/ASSERT_* macros do -- needs
+// a definition or the link fails. hush-gtest hit this on VERSION_HD_MNEMONIC.
+const int CHDChain::VERSION_HD_BASE;
+const int CHDChain::VERSION_HD_TRANSPARENT;
+const int CHDChain::VERSION_HD_MNEMONIC;
+const int CHDChain::CURRENT_VERSION;
+
 using namespace std;
 
 static uint64_t nAccountingEntryNumber = 0;