diff --git a/lkmc/pagemap.h b/lkmc/pagemap.h
index f8891ca..53921be 100644
--- a/lkmc/pagemap.h
+++ b/lkmc/pagemap.h
@@ -12,7 +12,7 @@
  * https://github.com/torvalds/linux/blob/v4.9/Documentation/vm/pagemap.txt
  */
 typedef struct {
-    uint64_t pfn : 54;
+    uint64_t pfn : 55;
     unsigned int soft_dirty : 1;
     unsigned int file_page : 1;
     unsigned int swapped : 1;
@@ -46,8 +46,8 @@ int lkmc_pagemap_get_entry(LkmcPagemapEntry *entry, int pagemap_fd, uintptr_t va
             return 1;
         }
     }
-    entry->pfn = data & (((uint64_t)1 << 54) - 1);
-    entry->soft_dirty = (data >> 54) & 1;
+    entry->pfn = data & (((uint64_t)1 << 55) - 1);
+    entry->soft_dirty = (data >> 55) & 1;
     entry->file_page = (data >> 61) & 1;
     entry->swapped = (data >> 62) & 1;
     entry->present = (data >> 63) & 1;
diff --git a/userland/linux/pagemap_dump.c b/userland/linux/pagemap_dump.c
index 02373fa..2579fb0 100644
--- a/userland/linux/pagemap_dump.c
+++ b/userland/linux/pagemap_dump.c
@@ -1,6 +1,7 @@
 /* https://cirosantilli.com/linux-kernel-module-cheat#pagemap-dump-out */
 
 #define _XOPEN_SOURCE 700
+#include <assert.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <stdint.h>
@@ -91,8 +92,10 @@ int main(int argc, char **argv) {
                 {
                     LkmcPagemapEntry entry;
                     for (uintptr_t vaddr = low; vaddr < high; vaddr += sysconf(_SC_PAGE_SIZE)) {
-                        /* TODO always fails for the last page (vsyscall), why? pread returns 0. */
-                        if (!lkmc_pagemap_get_entry(&entry, pagemap_fd, vaddr)) {
+                        if (lkmc_pagemap_get_entry(&entry, pagemap_fd, vaddr)) {
+                            /* TODO always fails for the last page (vsyscall), why? pread returns 0. */
+                            /*assert(0);*/
+                        } else {
                             printf(
                                 "%jx %jx %u %u %u %u %s\n",
                                 (uintmax_t)vaddr,