diff --git a/src/configure.in b/src/configure.in
index 8c781a7ea381536090d3ce5fc45fbfb9f505a7fa..1ce5086c79428c949716248dcda7db7a49f6fa5f 100644
--- a/src/configure.in
+++ b/src/configure.in
@@ -204,6 +204,8 @@ AC_HAVE_FUNCS(
  times \
  vfprintf \
  vsprintf \
+ wait4 \
+ waitpid \
 )
 
 define(MY_CHECK_HEADERS,