diff --git a/libc/src/stdlib/abs.h b/libc/src/stdlib/abs.h
index 19cef1446bd36..0447f759b4bf1 100644
--- a/libc/src/stdlib/abs.h
+++ b/libc/src/stdlib/abs.h
@@ -11,7 +11,7 @@
 
 namespace LIBC_NAMESPACE {
 
-int abs(int n);
+[[gnu::const]] int abs(int n);
 
 } // namespace LIBC_NAMESPACE