diff --git a/configure.in b/configure.in
index aa02cba2b..976a6b0df 100644
--- a/configure.in
+++ b/configure.in
@@ -26,6 +26,10 @@ AC_ARG_PROGRAM
 
 CFLAGS="-g"
 
+dnl test
+
+AM_C_PROTOTYPES
+
 dnl Checks for libraries.
 
 AC_FIND_FUNC(socket, socket)