diff --git a/linker/linker_phdr_16kib_compat.cpp b/linker/linker_phdr_16kib_compat.cpp
index bad20ba..d3783cf 100644
--- a/linker/linker_phdr_16kib_compat.cpp
+++ b/linker/linker_phdr_16kib_compat.cpp
@@ -158,7 +158,7 @@
   }
 
   if (!relro_phdr) {
-    *vaddr = align_down(first_rw->p_vaddr, kCompatPageSize);
+    *vaddr = __builtin_align_down(first_rw->p_vaddr, kCompatPageSize);
     return true;
   }
 
@@ -175,7 +175,7 @@
     return false;
   }
 
-  *vaddr = align_up(end, kCompatPageSize);
+  *vaddr = __builtin_align_up(end, kCompatPageSize);
   return true;
 }
 
@@ -227,11 +227,11 @@
   // will lead to overwriting adjacent segments since the ELF's segment(s)
   // are not 16KiB aligned.
 
-  void* start = reinterpret_cast<void*>(align_down(phdr->p_vaddr + load_bias_, kCompatPageSize));
+  void* start = reinterpret_cast<void*>(__builtin_align_down(phdr->p_vaddr + load_bias_, kCompatPageSize));
 
   // The ELF could be being loaded directly from a zipped APK,
   // the zip offset must be added to find the segment offset.
-  const ElfW(Addr) offset = file_offset_ + align_down(phdr->p_offset, kCompatPageSize);
+  const ElfW(Addr) offset = file_offset_ + __builtin_align_down(phdr->p_offset, kCompatPageSize);
 
   CHECK(should_use_16kib_app_compat_);