diff --git a/compiler-rt/lib/scudo/standalone/common.h b/compiler-rt/lib/scudo/standalone/common.h
--- a/compiler-rt/lib/scudo/standalone/common.h
+++ b/compiler-rt/lib/scudo/standalone/common.h
@@ -17,6 +17,7 @@
 
 #include <stddef.h>
 #include <string.h>
+#include <unistd.h>
 
 namespace scudo {
 
@@ -131,9 +132,10 @@
 extern uptr PageSizeCached;
 uptr getPageSizeSlow();
 inline uptr getPageSizeCached() {
-  // Bionic uses a hardcoded value.
-  if (SCUDO_ANDROID)
-    return 4096U;
+#if SCUDO_ANDROID && defined(PAGE_SIZE)
+  // Most Android builds have a build-time constant page size.
+  return PAGESIZE;
+#endif
   if (LIKELY(PageSizeCached))
     return PageSizeCached;
   return getPageSizeSlow();