diff --git a/mm/include/libc/alloca.h b/mm/include/libc/alloca.h
index 12bda3a55..68c40475e 100644
--- a/mm/include/libc/alloca.h
+++ b/mm/include/libc/alloca.h
@@ -1,7 +1,10 @@
 #ifndef LIBC_ALLOCA_H
 #define LIBC_ALLOCA_H
 
-// void* alloca(u32);
+#ifndef __linux__
+void* alloca(u32);
+#endif
+
 #define alloca  __builtin_alloca
 
 #endif