diff --git a/acinclude.m4 b/acinclude.m4
index ff33b72b6e..84423ec864 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -1603,13 +1603,6 @@ AC_CHECK_TYPE(ssize_t, int)
 AC_CHECK_TYPES(sig_t, , ,
   [#include <sys/types.h>
    #include <signal.h> ])
-AH_BOTTOM(
-[#ifndef HAVE_SIG_T
-#ifndef SIG_T_DEFINED
-#define SIG_T_DEFINED
-typedef RETSIGTYPE (*sig_t) ();
-#endif
-#endif])
 AC_CHECK_TYPE([sig_atomic_t], ,
     [AC_DEFINE([sig_atomic_t], [int],
         [Define to int if <signal.h> does not define.])],
diff --git a/src/kauth/user.c b/src/kauth/user.c
index e5c986c75c..770742a3a2 100644
--- a/src/kauth/user.c
+++ b/src/kauth/user.c
@@ -160,7 +160,7 @@ ka_UserAuthenticateGeneral(afs_int32 flags, char *name, char *instance,
     struct ktc_encryptionKey key;
     afs_int32 code, dosetpag = 0;
 #if !defined(AFS_NT40_ENV) && !defined(AFS_LINUX20_ENV) && !defined(AFS_USR_LINUX20_ENV) && !defined(AFS_XBSD_ENV) || defined(AFS_FBSD_ENV)
-    sig_t old;
+    void (*old)(int);
 #endif
 
     if (reasonP)
diff --git a/src/sys/pioctl.c b/src/sys/pioctl.c
index 06c2bccba3..818b8c0f24 100644
--- a/src/sys/pioctl.c
+++ b/src/sys/pioctl.c
@@ -56,7 +56,7 @@ lpioctl(char *path, int cmd, void *cmarg, int follow)
 #ifndef AFS_LINUX20_ENV
     /* As kauth/user.c says, handle smoothly the case where no AFS system call
      * exists (yet). */
-    sig_t old = signal(SIGSYS, SIG_IGN);
+    void (*old)(int) = signal(SIGSYS, SIG_IGN);
 #endif
 
 #if defined(AFS_LINUX20_ENV)