diff --git a/src/qml/jsruntime/qv4global_p.h b/src/qml/jsruntime/qv4global_p.h
index a00231c..2a8f5d3 100644
--- a/src/qml/jsruntime/qv4global_p.h
+++ b/src/qml/jsruntime/qv4global_p.h
@@ -85,7 +85,7 @@ inline double trunc(double d) { return d
 
 // Black list some platforms
 #if defined(V4_ENABLE_JIT)
-#if defined(Q_OS_IOS) || defined(Q_OS_WINRT)
+#if defined(Q_OS_IOS) || defined(Q_OS_WINRT) || (defined(Q_PROCESSOR_X86) && !defined(__SSE2__))
 #    undef V4_ENABLE_JIT
 #endif
 #endif