diff --git a/applets/busybox.c b/applets/busybox.c
index 67a606cc4..c050acc9c 100644
--- a/applets/busybox.c
+++ b/applets/busybox.c
@@ -45,6 +45,9 @@ static const struct Applet applets[] = {
 #ifdef BB_DMESG			//bin
     {"dmesg", dmesg_main},
 #endif
+#ifdef BB_DU			//bin
+    {"du", du_main},
+#endif
 #ifdef BB_DUTMP			//usr/sbin
     {"dutmp", dutmp_main},
 #endif
diff --git a/busybox.c b/busybox.c
index 67a606cc4..c050acc9c 100644
--- a/busybox.c
+++ b/busybox.c
@@ -45,6 +45,9 @@ static const struct Applet applets[] = {
 #ifdef BB_DMESG			//bin
     {"dmesg", dmesg_main},
 #endif
+#ifdef BB_DU			//bin
+    {"du", du_main},
+#endif
 #ifdef BB_DUTMP			//usr/sbin
     {"dutmp", dutmp_main},
 #endif
diff --git a/busybox.def.h b/busybox.def.h
index 786f98119..efab4941c 100644
--- a/busybox.def.h
+++ b/busybox.def.h
@@ -14,6 +14,7 @@
 #define BB_DF
 #define BB_DMESG
 //#define BB_DUTMP
+#define BB_DU
 //#define BB_FDFLUSH
 #define BB_FIND
 #define BB_FREE
diff --git a/internal.h b/internal.h
index 42c6b93ab..830d30eb4 100644
--- a/internal.h
+++ b/internal.h
@@ -63,6 +63,7 @@ extern int date_main(int argc, char** argv);
 extern int dd_main(int argc, char** argv);
 extern int df_main(int argc, char** argv);
 extern int dmesg_main(int argc, char** argv);
+extern int du_main(int argc, char** argv);
 extern int dutmp_main(int argc, char** argv);
 extern int false_main(int argc, char** argv);
 extern int fdisk_main(int argc, char** argv);