1 files changed, 4 insertions, 1 deletions

diff --git a/src/alloc.c b/src/alloc.c
index 958da1dbbb0..da2b7ac4330 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -3254,7 +3254,10 @@ allocate_vectorlike (ptrdiff_t len)
   /* eassert (!handling_signal); */
 
   if (len == 0)
-    return zero_vector;
+    {
+      MALLOC_UNBLOCK_INPUT;
+      return zero_vector;
+    }
 
   nbytes = header_size + len * word_size;