diff --git a/lib/libc_r/uthread/pthread_private.h b/lib/libc_r/uthread/pthread_private.h
index 0d99de4f3fae..78b75ef4dce9 100644
--- a/lib/libc_r/uthread/pthread_private.h
+++ b/lib/libc_r/uthread/pthread_private.h
@@ -114,12 +114,12 @@
 #define stdout_debug(args...)	do {		\
 	char buf[128];				\
 	snprintf(buf, sizeof(buf), ##args);	\
-	_thread_sys_write(1, buf, strlen(buf));	\
+	__sys_write(1, buf, strlen(buf));	\
 } while (0)
 #define stderr_debug(args...)	do {		\
 	char buf[128];				\
 	snprintf(buf, sizeof(buf), ##args);	\
-	_thread_sys_write(2, buf, strlen(buf));	\
+	__sys_write(2, buf, strlen(buf));	\
 } while (0)
 
 
diff --git a/lib/libkse/thread/thr_private.h b/lib/libkse/thread/thr_private.h
index 0d99de4f3fae..78b75ef4dce9 100644
--- a/lib/libkse/thread/thr_private.h
+++ b/lib/libkse/thread/thr_private.h
@@ -114,12 +114,12 @@
 #define stdout_debug(args...)	do {		\
 	char buf[128];				\
 	snprintf(buf, sizeof(buf), ##args);	\
-	_thread_sys_write(1, buf, strlen(buf));	\
+	__sys_write(1, buf, strlen(buf));	\
 } while (0)
 #define stderr_debug(args...)	do {		\
 	char buf[128];				\
 	snprintf(buf, sizeof(buf), ##args);	\
-	_thread_sys_write(2, buf, strlen(buf));	\
+	__sys_write(2, buf, strlen(buf));	\
 } while (0)
 
 
diff --git a/lib/libpthread/thread/thr_private.h b/lib/libpthread/thread/thr_private.h
index 0d99de4f3fae..78b75ef4dce9 100644
--- a/lib/libpthread/thread/thr_private.h
+++ b/lib/libpthread/thread/thr_private.h
@@ -114,12 +114,12 @@
 #define stdout_debug(args...)	do {		\
 	char buf[128];				\
 	snprintf(buf, sizeof(buf), ##args);	\
-	_thread_sys_write(1, buf, strlen(buf));	\
+	__sys_write(1, buf, strlen(buf));	\
 } while (0)
 #define stderr_debug(args...)	do {		\
 	char buf[128];				\
 	snprintf(buf, sizeof(buf), ##args);	\
-	_thread_sys_write(2, buf, strlen(buf));	\
+	__sys_write(2, buf, strlen(buf));	\
 } while (0)