diff --git a/src/hotspot/os/posix/malloctrace/mallocTracePosix.cpp b/src/hotspot/os/posix/malloctrace/mallocTracePosix.cpp
index 7a3a08afa17..a3b8e3cdfe8 100644
--- a/src/hotspot/os/posix/malloctrace/mallocTracePosix.cpp
+++ b/src/hotspot/os/posix/malloctrace/mallocTracePosix.cpp
@@ -2522,6 +2522,7 @@ class MallocTraceEnablePeriodicTask : public PeriodicTask {
 void MallocTraceEnablePeriodicTask::task() {
   enable_from_flags();
   enable_delayed_dump();
+  disenroll();
 }
 
 } // namespace mallocStatImpl
diff --git a/src/hotspot/share/runtime/globals.hpp b/src/hotspot/share/runtime/globals.hpp
index 7093e411dab..4780aa835fd 100644
--- a/src/hotspot/share/runtime/globals.hpp
+++ b/src/hotspot/share/runtime/globals.hpp
@@ -695,7 +695,7 @@ define_pd_global(uint64_t,MaxRAM,                    1ULL*G);
           "malloc trace if enabled at startup.")                            \
           range(1, 1000)                                                    \
                                                                             \
-  product(bool, MallocTraceUseBacktrace, true,                              \
+  product(bool, MallocTraceUseBacktrace, PPC_ONLY(false) NOT_PPC(true),     \
           "If set we use the backtrace() call to sample the stacks of "     \
           "the malloc trace if enabled at startup. Note that while this "   \
           "creates better stack traces, it is also slower and not "         \