diff --git a/include/mimalloc-types.h b/include/mimalloc-types.h
index b0b4a44f..ec382b5e 100644
--- a/include/mimalloc-types.h
+++ b/include/mimalloc-types.h
@@ -211,9 +211,9 @@ typedef struct mi_page_s {
   struct mi_page_s*     prev;              // previous page owned by this thread with the same `block_size`
 
   // improve page index calculation
-  // without padding: 10 words on 64-bit, 11 on 32-bit. Secure adds two words
-  #if (MI_INTPTR_SIZE==4)
-  void*                 padding[1];        // 12/14 words on 32-bit plain
+  // without padding: 11 words on 64-bit, 14 on 32-bit. Secure adds two words
+  #if (MI_INTPTR_SIZE==8)
+  void*                 padding[1];        // 12/14 words on 64-bit
   #endif
 } mi_page_t;
 
diff --git a/src/init.c b/src/init.c
index 1409faaa..51c18d93 100644
--- a/src/init.c
+++ b/src/init.c
@@ -26,7 +26,7 @@ const mi_page_t _mi_page_empty = {
   NULL,
   ATOMIC_VAR_INIT(0), ATOMIC_VAR_INIT(0),
   0, NULL, NULL, NULL
-  #if (MI_INTPTR_SIZE==4)
+  #if (MI_INTPTR_SIZE==8)
   , { NULL } // padding
   #endif
 };