@@ -25,6 +25,8 @@
   (This particular implementation uses Posix ucontext swapcontext().)
 */
 
+#define HAVE_VALGRIND
+
 #ifdef _WIN32
 #define MY_CONTEXT_USE_WIN32_FIBERS 1
 #elif defined(__GNUC__) && __GNUC__ >= 3 && defined(__x86_64__) && !defined(__ILP32__)
