diff --git a/autoconf.in b/autoconf.in
index 4e667b93..e6b0819f 100644
--- a/autoconf.in
+++ b/autoconf.in
@@ -1,4 +1,4 @@
-#! /bin/sh
+#! @SHELL@
 # autoconf -- create `configure' using m4 macros
 # Copyright (C) 1992, 1993, 1994, 1996 Free Software Foundation, Inc.
 
diff --git a/autoconf.sh b/autoconf.sh
index 4e667b93..e6b0819f 100644
--- a/autoconf.sh
+++ b/autoconf.sh
@@ -1,4 +1,4 @@
-#! /bin/sh
+#! @SHELL@
 # autoconf -- create `configure' using m4 macros
 # Copyright (C) 1992, 1993, 1994, 1996 Free Software Foundation, Inc.
 
diff --git a/bin/autoconf.in b/bin/autoconf.in
index 4e667b93..e6b0819f 100644
--- a/bin/autoconf.in
+++ b/bin/autoconf.in
@@ -1,4 +1,4 @@
-#! /bin/sh
+#! @SHELL@
 # autoconf -- create `configure' using m4 macros
 # Copyright (C) 1992, 1993, 1994, 1996 Free Software Foundation, Inc.