diff --git a/libc/include/unistd.h b/libc/include/unistd.h
index 98fab52..9385264 100644
--- a/libc/include/unistd.h
+++ b/libc/include/unistd.h
@@ -302,7 +302,7 @@
 
 int acct(const char* _Nullable __path);
 
-int getpagesize(void);
+int getpagesize(void) __attribute_const__;
 
 long syscall(long __number, ...);