diff --git a/examples/mem_invalid_access.py b/examples/mem_invalid_access.py
index 7d9c7d20..38097b03 100644
--- a/examples/mem_invalid_access.py
+++ b/examples/mem_invalid_access.py
@@ -11,8 +11,8 @@ from qiling.const import QL_VERBOSE
 def mem_crash(ql: Qiling, access: int, address: int, size: int, value: int):
     print(f'got crash')
 
-    PAGE_SIZE = 0x1000
-    aligned = address & ~(PAGE_SIZE - 1)
+    PAGE_SIZE = ql.mem.pagesize
+    aligned = ql.mem.align(address)
 
     # map the entire page containing the invalid address and fill it with 'Q's
     ql.mem.map(aligned, PAGE_SIZE)
diff --git a/qiling/extensions/idaplugin/qilingida.py b/qiling/extensions/idaplugin/qilingida.py
index 7ea3ea92..ad6f3709 100644
--- a/qiling/extensions/idaplugin/qilingida.py
+++ b/qiling/extensions/idaplugin/qilingida.py
@@ -42,7 +42,7 @@ from PyQt5 import QtCore, QtWidgets
 from PyQt5.QtWidgets import (QPushButton, QHBoxLayout)
 
 # Qiling
-from qiling import *
+from qiling import Qiling
 from qiling.const import *
 from qiling.arch.x86_const import reg_map_32 as x86_reg_map_32
 from qiling.arch.x86_const import reg_map_64 as x86_reg_map_64
@@ -1568,16 +1568,16 @@ class QlEmuPlugin(plugin_t, UI_Hooks):
                 self.paths[start_bb_id].append(cur_bb.id)
             ql.emu_stop()
 
-    def _skip_unmapped_rw(self, ql, type, addr, size, value):
-        alignment = 0x1000
-        # Round down
-        map_addr = addr & (~(alignment - 1))
-        # Round up
-        map_size = ((size + (alignment - 1)) & (~(alignment - 1)))
+    def _skip_unmapped_rw(self, ql: Qiling, type, addr, size, value):
+        map_addr = ql.mem.align(addr)
+        map_size = ql.mem.align_up(size)
+
         if not ql.mem.is_mapped(map_addr, map_size):
             logging.warning(f"Invalid memory R/W, trying to map {hex(map_size)} at {hex(map_addr)}")
+
             ql.mem.map(map_addr, map_size)
-            ql.mem.write(map_addr, b'\x00'*map_size)
+            ql.mem.write(map_addr, b'\x00' * map_size)
+
         return True
 
     def _find_branch_in_real_block(self, bb):
diff --git a/qiling/os/posix/syscall/mman.py b/qiling/os/posix/syscall/mman.py
index e68654b2..2556a2a6 100755
--- a/qiling/os/posix/syscall/mman.py
+++ b/qiling/os/posix/syscall/mman.py
@@ -84,11 +84,12 @@ def syscall_mmap_impl(ql: Qiling, addr: int, mlen: int, prot: int, flags: int, f
 
     need_mmap = True
     mmap_base = addr
-    mmap_size = (mlen - (addr & (pagesize - 1)) + pagesize - 1) & ~(pagesize - 1)
+    mmap_size = ql.mem.align_up(mlen - ql.mem.align(addr))
 
     if ql.ostype != QL_OS.QNX:
-        mmap_base &= ~(pagesize - 1)
-        if (flags & MAP_FIXED) > 0 and mmap_base != addr:
+        mmap_base = ql.mem.align(mmap_base)
+
+        if (flags & MAP_FIXED) and mmap_base != addr:
             return MAP_FAILED
 
     # initial ql.loader.mmap_address