diff --git a/src/unix/core.c b/src/unix/core.c
index b393097f..9680a2d0 100644
--- a/src/unix/core.c
+++ b/src/unix/core.c
@@ -605,7 +605,7 @@ int uv_cwd(char* buffer, size_t* size) {
   if (getcwd(buffer, *size) == NULL)
     return -errno;
 
-  *size = strlen(buffer);
+  *size = strlen(buffer) + 1;
   return 0;
 }