diff --git a/qemu-os-win32.h b/qemu-os-win32.h
index b6533c0979..753679b194 100644
--- a/qemu-os-win32.h
+++ b/qemu-os-win32.h
@@ -56,6 +56,15 @@
 # define EWOULDBLOCK  WSAEWOULDBLOCK
 #endif
 
+#if defined(_WIN64)
+/* On w64, setjmp is implemented by _setjmp which needs a second parameter.
+ * If this parameter is NULL, longjump does no stack unwinding.
+ * That is what we need for QEMU. Passing the value of register rsp (default)
+ * lets longjmp try a stack unwinding which will crash with generated code. */
+# undef setjmp
+# define setjmp(env) _setjmp(env, NULL)
+#endif
+
 /* Declaration of ffs() is missing in MinGW's strings.h. */
 int ffs(int i);