--- Objects/obmalloc.c
+++ Objects/obmalloc.c
@@ -722,8 +722,8 @@
 
 #ifdef WITH_PYMALLOC
 
+#define WITH_VALGRIND
 #ifdef WITH_VALGRIND
-#include <valgrind/valgrind.h>
 
 /* -1 indicates that we haven't checked that we're running on valgrind yet. */
 static int running_on_valgrind = -1;
@@ -1591,7 +1591,7 @@
 {
 #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;