diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index 75ca325d0..36a907df5 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -2516,7 +2516,7 @@ void CWallet::DeleteTransactions(std::vector<uint256> &removeTxs) {
         }
     }
 //TODO: the build system should check for malloc_trim support
-#if defined(__unix__)
+#if defined(__linux__)
     malloc_trim(0);
 #else
     // On Mac and Win memory isn't kept back upon vector or list member erase, different garbage collector strategy. No need to force trimming.