diff --git a/coredump/criu_coredump/coredump.py b/coredump/criu_coredump/coredump.py
index 3c9cd45aa..acb806ace 100644
--- a/coredump/criu_coredump/coredump.py
+++ b/coredump/criu_coredump/coredump.py
@@ -794,7 +794,8 @@ class coredump_generator:
         off = 0  # in pages
         for m in pagemap[1:]:
             found = False
-            num_pages = m.get("nr_pages", m.compat_nr_pages)
+            num_pages = m.get("nr_pages", m["compat_nr_pages"])
+
             for i in range(num_pages):
                 if m["vaddr"] + i * PAGESIZE == page_no * PAGESIZE:
                     found = True