diff --git a/src/main.h b/src/main.h
index 7a2d432628..18d674612f 100644
--- a/src/main.h
+++ b/src/main.h
@@ -38,8 +38,8 @@ class CScriptCheck;
 class CTxMemPool;
 class CValidationInterface;
 class CValidationState;
-class PrecomputedTransactionData;
 
+struct PrecomputedTransactionData;
 struct CNodeStateStats;
 struct LockPoints;