diff --git a/libc/bionic/getauxval.cpp b/libc/bionic/getauxval.cpp
index bc41824..22922b9 100644
--- a/libc/bionic/getauxval.cpp
+++ b/libc/bionic/getauxval.cpp
@@ -31,6 +31,7 @@
 #include <sys/auxv.h>
 #include <private/bionic_auxv.h>
 #include <elf.h>
+#include <errno.h>
 
 __LIBC_HIDDEN__ ElfW(auxv_t)* __libc_auxv = NULL;
 
@@ -40,5 +41,6 @@
       return v->a_un.a_val;
     }
   }
+  errno = ENOENT;
   return 0;
 }