--- Objects/obmalloc.c
+++ Objects/obmalloc.c
@@ -712,8 +712,8 @@
 
 #ifdef WITH_PYMALLOC
 
+#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 */
@@ -1430,7 +1430,7 @@
 
 #ifdef WITH_VALGRIND
     if (UNLIKELY(running_on_valgrind == -1)) {
-        running_on_valgrind = RUNNING_ON_VALGRIND;
+        running_on_valgrind = 1;
     }
     if (UNLIKELY(running_on_valgrind)) {
         return NULL;