diff --git a/configure.ac b/configure.ac
index 1af433377..a570a36ef 100644
--- a/configure.ac
+++ b/configure.ac
@@ -920,6 +920,7 @@ AC_CHECK_FUNCS( socket \
                 tcgetattr \
                 perror \
                 closesocket \
+                siginterrupt \
                 sigaction \
                 signal \
                 getpass_r \