diff --git a/configure.ac b/configure.ac
index 07c0a3d..6f72b2a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -103,10 +103,9 @@ yes
 
 if test "$IPC_SUPPORT" = "yes"; then
   AC_CHECK_HEADERS([sys/ipc.h], [], [IPC_SUPPORT=no])
-  AC_CHECK_HEADERS([sys/msg.h], [], [IPC_SUPPORT=no])
   AC_CHECK_HEADERS([sys/param.h])
   if test "$IPC_SUPPORT" = "yes"; then
-    AC_CHECK_FUNCS([msgget], [], [IPC_SUPPORT=no])
+    AC_CHECK_FUNCS([shmget], [], [IPC_SUPPORT=no])
   fi
 fi