diff --git i/src/v8/v8.pri w/src/v8/v8.pri
index ec0561a..03d4bf7 100644
--- i/src/v8/v8.pri
+++ w/src/v8/v8.pri
@@ -7,7 +7,7 @@ isEmpty(QT_ARCH) {
 
 isEmpty(V8_TARGET_ARCH) {
     # Detect target
-    equals(QT_ARCH, x86_64)|contains(CONFIG, x86_64):V8_TARGET_ARCH = x64
+    equals(QT_ARCH, x86_64):                         V8_TARGET_ARCH = x64
     else:equals(QT_ARCH, "i386"):                    V8_TARGET_ARCH = ia32
     else:equals(QT_ARCH, "mips"):                    V8_TARGET_ARCH = mips
     else:equals(QT_ARCH, "arm"):                     V8_TARGET_ARCH = arm