diff --git a/libc/Android.mk b/libc/Android.mk
index e860d17..1496d1f 100644
--- a/libc/Android.mk
+++ b/libc/Android.mk
@@ -886,6 +886,10 @@
 LOCAL_ADDITIONAL_DEPENDENCIES := $(libc_common_additional_dependencies)
 LOCAL_SYSTEM_SHARED_LIBRARIES :=
 
+# Set -DPTHREAD_DEBUG_ENABLED=true to enable support for pthread deadlock prediction.
+# Since this code is experimental it is disabled by default.
+LOCAL_CFLAGS += $(libc_common_cflags) -DPTHREAD_DEBUG_ENABLED=false
+
 include $(BUILD_STATIC_LIBRARY)
 
 
@@ -979,13 +983,7 @@
 # ========================================================
 include $(CLEAR_VARS)
 
-# pthread deadlock prediction:
-# set -DPTHREAD_DEBUG -DPTHREAD_DEBUG_ENABLED=1 to enable support for
-# pthread deadlock prediction.
-# Since this code is experimental it is disabled by default.
-# see libc/bionic/pthread_debug.c for details
-
-LOCAL_CFLAGS := $(libc_common_cflags) -DPTHREAD_DEBUG -DPTHREAD_DEBUG_ENABLED=0
+LOCAL_CFLAGS := $(libc_common_cflags)
 LOCAL_CONLYFLAGS := $(libc_common_conlyflags)
 LOCAL_CPPFLAGS := $(libc_common_cppflags)
 LOCAL_C_INCLUDES := $(libc_common_c_includes)
diff --git a/libc/bionic/pthread_mutex.cpp b/libc/bionic/pthread_mutex.cpp
index 6b82151..7e43cd8 100644
--- a/libc/bionic/pthread_mutex.cpp
+++ b/libc/bionic/pthread_mutex.cpp
@@ -553,13 +553,11 @@
 int pthread_mutex_lock(pthread_mutex_t *mutex)
 {
     int err = pthread_mutex_lock_impl(mutex);
-#ifdef PTHREAD_DEBUG
     if (PTHREAD_DEBUG_ENABLED) {
         if (!err) {
             pthread_debug_mutex_lock_check(mutex);
         }
     }
-#endif
     return err;
 }
 
@@ -622,11 +620,9 @@
 
 int pthread_mutex_unlock(pthread_mutex_t *mutex)
 {
-#ifdef PTHREAD_DEBUG
     if (PTHREAD_DEBUG_ENABLED) {
         pthread_debug_mutex_unlock_check(mutex);
     }
-#endif
     return pthread_mutex_unlock_impl(mutex);
 }
 
@@ -678,13 +674,11 @@
 int pthread_mutex_trylock(pthread_mutex_t *mutex)
 {
     int err = pthread_mutex_trylock_impl(mutex);
-#ifdef PTHREAD_DEBUG
     if (PTHREAD_DEBUG_ENABLED) {
         if (!err) {
             pthread_debug_mutex_lock_check(mutex);
         }
     }
-#endif
     return err;
 }
 
@@ -819,13 +813,11 @@
 int pthread_mutex_lock_timeout_np(pthread_mutex_t *mutex, unsigned msecs)
 {
     int err = pthread_mutex_lock_timeout_np_impl(mutex, msecs);
-#ifdef PTHREAD_DEBUG
     if (PTHREAD_DEBUG_ENABLED) {
         if (!err) {
             pthread_debug_mutex_lock_check(mutex);
         }
     }
-#endif
     return err;
 }