--- Objects/obmalloc.c
+++ Objects/obmalloc.c
@@ -9,8 +9,8 @@
  #endif
 #endif
 
+#define WITH_VALGRIND
 #ifdef WITH_VALGRIND
-#include <valgrind/valgrind.h>
 
 /* If we're using GCC, use __builtin_expect() to reduce overhead of
    the valgrind checks */
@@ -771,7 +771,7 @@
 
 #ifdef WITH_VALGRIND
     if (UNLIKELY(running_on_valgrind == -1))
-        running_on_valgrind = RUNNING_ON_VALGRIND;
+        running_on_valgrind = 1;
     if (UNLIKELY(running_on_valgrind))
         goto redirect;
 #endif