diff --git a/source/configure.in b/source/configure.in
index 78cc8709637..746fb9eb891 100644
--- a/source/configure.in
+++ b/source/configure.in
@@ -394,6 +394,8 @@ exit(1);
        AC_TRY_RUN([
 #include <unistd.h>
 #include <sys/utsname.h>
+#include <string.h>
+#include <stdlib.h>
 main() {
 #if _LFS64_LARGEFILE == 1
        struct utsname uts;