diff --git a/src/usermanager.cpp b/src/usermanager.cpp
index 23ffa53d92917d3d4358c8c3ab08b8f8e269f781..4a36eebf63301639a44383bca22280d531108c53 100644
--- a/src/usermanager.cpp
+++ b/src/usermanager.cpp
@@ -33,9 +33,11 @@
 #include "Swiften/Elements/StreamError.h"
 #include "Swiften/Elements/MUCPayload.h"
 #include "Swiften/Elements/ChatState.h"
-#ifndef __FreeBSD__
+#ifndef __FreeBSD__ 
+#ifndef __MACH__
 #include "malloc.h"
 #endif
+#endif
 // #include "valgrind/memcheck.h"
 
 namespace Transport {
@@ -130,9 +132,11 @@ void UserManager::removeUser(User *user, bool onUserBehalf) {
 	delete user;
 #ifndef WIN32
 #ifndef __FreeBSD__
+#ifndef __MACH__
 	malloc_trim(0);
 #endif
 #endif
+#endif
 // 	VALGRIND_DO_LEAK_CHECK;
 }