diff --git a/src/corelib/platform/wasm/qstdweb_p.h b/src/corelib/platform/wasm/qstdweb_p.h
index 566e02e8a1..a3b5bd5b6b 100644
--- a/src/corelib/platform/wasm/qstdweb_p.h
+++ b/src/corelib/platform/wasm/qstdweb_p.h
@@ -282,7 +282,7 @@ namespace qstdweb {
     }
 
     bool haveAsyncify();
-    bool haveJspi();
+    bool Q_CORE_EXPORT haveJspi();
     bool canBlockCallingThread();
 
     struct CancellationFlag