diff --git a/src/dlmalloc.h b/src/dlmalloc.h
index cb09308..e696f6e 100644
--- a/src/dlmalloc.h
+++ b/src/dlmalloc.h
@@ -31,4 +31,16 @@
 #include "dlmalloc/malloc.h"
 #endif
 
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void dlmalloc_inspect_all(void(*handler)(void*, void *, size_t, void*), void* arg);
+
+#ifdef __cplusplus
+};  /* end of extern "C" */
+#endif
+
 #endif  // ART_SRC_DLMALLOC_H_
diff --git a/src/native/dalvik_system_VMRuntime.cc b/src/native/dalvik_system_VMRuntime.cc
index 8dbbc77..33ece66 100644
--- a/src/native/dalvik_system_VMRuntime.cc
+++ b/src/native/dalvik_system_VMRuntime.cc
@@ -171,11 +171,7 @@
       heap->Trim(alloc_space);
       // Trim the native heap.
       dlmalloc_trim(0);
-#if 0 // TODO: switch over to this when bionic has moved to dlmalloc 2.8.5
       dlmalloc_inspect_all(MspaceMadviseCallback, NULL);
-#else
-      dlmalloc_walk_free_pages(MspaceMadviseCallback, NULL);
-#endif
       LOG(INFO) << "Parallel heap trimming took " << PrettyDuration(NanoTime() - start_ns)
                 << " on a " << PrettySize(alloc_space_size)
                 << " alloc space with " << static_cast<int>(100 * utilization) << "% utilization";
diff --git a/src/space.cc b/src/space.cc
index f0f9323..324b495 100644
--- a/src/space.cc
+++ b/src/space.cc
@@ -319,7 +319,11 @@
   return mspace_usable_size(const_cast<void*>(reinterpret_cast<const void*>(obj))) + kChunkOverhead;
 }
 
-void MspaceMadviseCallback(void* start, void* end, void* /*arg*/) {
+void MspaceMadviseCallback(void* start, void* end, size_t used_bytes, void* /* arg */) {
+  // Is this chunk in use?
+  if (used_bytes != 0) {
+    return;
+  }
   // Do we have any whole pages to give back?
   start = reinterpret_cast<void*>(RoundUp(reinterpret_cast<uintptr_t>(start), kPageSize));
   end = reinterpret_cast<void*>(RoundDown(reinterpret_cast<uintptr_t>(end), kPageSize));
@@ -329,14 +333,6 @@
   }
 }
 
-void MspaceMadviseCallback(void* start, void* end, size_t used_bytes, void* arg) {
-  // Is this chunk in use?
-  if (used_bytes != 0) {
-    return;
-  }
-  return MspaceMadviseCallback(start, end, arg);
-}
-
 void AllocSpace::Trim() {
   MutexLock mu(lock_);
   // Trim to release memory at the end of the space.
diff --git a/src/space.h b/src/space.h
index bc1493d..79d5ad4 100644
--- a/src/space.h
+++ b/src/space.h
@@ -320,8 +320,6 @@
 // Callback for dlmalloc_inspect_all or mspace_inspect_all that will madvise(2) unused
 // pages back to the kernel.
 void MspaceMadviseCallback(void* start, void* end, size_t used_bytes, void* /*arg*/);
-// Callback for the obsolete dlmalloc_walk_free_pages.
-void MspaceMadviseCallback(void* start, void* end, void* /*arg*/);
 
 }  // namespace art