diff --git a/libc/include/errno.h b/libc/include/errno.h
index 96ed3e7eb..13f70fb35 100644
--- a/libc/include/errno.h
+++ b/libc/include/errno.h
@@ -11,6 +11,7 @@
 #define ENOTSUP 7
 #define EBADF 8
 #define EEXISTS 9
+#define ENOTEMPTY 10
 
 __BEGIN_DECLS
 
diff --git a/libc/string/strerror.cpp b/libc/string/strerror.cpp
index 70f4d7856..762802876 100644
--- a/libc/string/strerror.cpp
+++ b/libc/string/strerror.cpp
@@ -37,6 +37,9 @@ char* strerror(int error)
 	case EEXISTS:
 		strcpy(buffer, "File exists");
 		break;
+	case ENOTEMPTY:
+		strcpy(buffer, "Directory not empty");
+		break;
 	default:
 		{
 			// FIXME: sprintf