1 files changed, 1 insertions, 1 deletions
diff --git a/src/nvim/ops.c b/src/nvim/ops.c
index 8270641256..96deae228f 100644
--- a/src/nvim/ops.c
+++ b/src/nvim/ops.c
@@ -4770,7 +4770,7 @@ int do_addsub(int op_type, pos_T *pos, int length, linenr_T Prenum1)
         }
       }
 
-      while (bits > 0) {
+      while (bits > 0 && i < NUMBUFLEN - 1) {
         buf2[i++] = ((n >> --bits) & 0x1) ? '1' : '0';
       }