diff --git a/configure.ac b/configure.ac
index be97d9c8a08..eff55915436 100644
--- a/configure.ac
+++ b/configure.ac
@@ -4909,7 +4909,7 @@ emacs_broken_SIGIO=no
 
 case $opsys in
   dnl SIGIO exists, but the feature doesn't work in the way Emacs needs.
-  hpux* | nacl | openbsd | solaris | unixware )
+  hpux* | nacl | solaris | unixware )
     emacs_broken_SIGIO=yes
     ;;