diff --git a/src/plugins/languageclient/languageclient.qbs b/src/plugins/languageclient/languageclient.qbs
index 7f1899927fe..5bb5e1ac11e 100644
--- a/src/plugins/languageclient/languageclient.qbs
+++ b/src/plugins/languageclient/languageclient.qbs
@@ -67,5 +67,10 @@ QtcPlugin {
         "snippet.h",
     ]
 
+    Properties {
+        condition: qbs.toolchain.contains("mingw")
+        cpp.cxxFlags: "-Wa,-mbig-obj"
+    }
+
     Export { Depends { name: "LanguageServerProtocol" } }
 }