diff --git a/tests/auto/other/compiler/tst_compiler.cpp b/tests/auto/other/compiler/tst_compiler.cpp
index 5ef247483de..2c95002cb23 100644
--- a/tests/auto/other/compiler/tst_compiler.cpp
+++ b/tests/auto/other/compiler/tst_compiler.cpp
@@ -637,6 +637,7 @@ void tst_Compiler::cxx11_alignas()
     QSKIP("Compiler does not support C++11 feature");
 #else
     alignas(double) char c;
+    Q_UNUSED(c);
     QCOMPARE(Q_ALIGNOF(c), Q_ALIGNOF(double));
 #endif
 }