diff --git a/CHANGES/1225.bugfix.rst b/CHANGES/1225.bugfix.rst
new file mode 120000
index 000000000..81bf8d823
--- /dev/null
+++ b/CHANGES/1225.bugfix.rst
@@ -0,0 +1 @@
+1226.bugfix.rst
\ No newline at end of file
diff --git a/CHANGES/1226.bugfix.rst b/CHANGES/1226.bugfix.rst
new file mode 100644
index 000000000..de4b67994
--- /dev/null
+++ b/CHANGES/1226.bugfix.rst
@@ -0,0 +1 @@
+Fixed format string compilation errors in debug builds on 32-bit platforms by using portable ``%zd`` format specifiers for ``Py_ssize_t`` values instead of ``%ld`` -- by :user:`bdraco`.
\ No newline at end of file
diff --git a/multidict/_multilib/hashtable.h b/multidict/_multilib/hashtable.h
index 438acbc90..0e0a28e50 100644
--- a/multidict/_multilib/hashtable.h
+++ b/multidict/_multilib/hashtable.h
@@ -1963,7 +1963,7 @@ static inline int
 _md_dump(MultiDictObject *md)
 {
     htkeys_t *keys = md->keys;
-    printf("Dump %p [%ld from %ld usable %ld nentries %ld]\n",
+    printf("Dump %p [%zd from %zd usable %zd nentries %zd]\n",
            (void *)md,
            md->used,
            htkeys_nslots(keys),
@@ -1971,7 +1971,7 @@ _md_dump(MultiDictObject *md)
            keys->nentries);
     for (Py_ssize_t i = 0; i < htkeys_nslots(keys); i++) {
         Py_ssize_t ix = htkeys_get_index(keys, i);
-        printf("  %ld -> %ld\n", i, ix);
+        printf("  %zd -> %zd\n", i, ix);
     }
     printf("  --------\n");
     entry_t *entries = htkeys_entries(keys);
@@ -1980,9 +1980,9 @@ _md_dump(MultiDictObject *md)
         PyObject *identity = entry->identity;
 
         if (identity == NULL) {
-            printf("  %ld [deleted]\n", i);
+            printf("  %zd [deleted]\n", i);
         } else {
-            printf("  %ld h=%20ld, i=\'", i, entry->hash);
+            printf("  %zd h=%20zd, i=\'", i, entry->hash);
             PyObject_Print(entry->identity, stdout, Py_PRINT_RAW);
             printf("\', k=\'");
             PyObject_Print(entry->key, stdout, Py_PRINT_RAW);