diff --git a/SheepShaver/src/Unix/configure.ac b/SheepShaver/src/Unix/configure.ac
index 5a4f5c7a..331d0506 100644
--- a/SheepShaver/src/Unix/configure.ac
+++ b/SheepShaver/src/Unix/configure.ac
@@ -487,7 +487,7 @@ AC_CACHE_CHECK([whether compiler supports byte bit-fields],
 ])
 
 dnl AC_CHECK_FRAMEWORK($1=NAME, $2=INCLUDES)
-AC_DEFUN(AC_CHECK_FRAMEWORK, [
+AC_DEFUN([AC_CHECK_FRAMEWORK], [
   AS_VAR_PUSHDEF([ac_Framework], [ac_cv_framework_$1])dnl
   AC_CACHE_CHECK([whether compiler supports framework $1],
     ac_Framework, [
@@ -613,7 +613,7 @@ dnl to be put into the config.h file
 dnl $1 -- the macro to define
 dnl $2 -- the value to translate
 dnl $3 -- template name
-AC_DEFUN(AC_TRANSLATE_DEFINE, [
+AC_DEFUN([AC_TRANSLATE_DEFINE], [
     if [[ "x$2" = "xyes" -o "x$2" = "xguessing yes" ]]; then
         AC_DEFINE($1, 1, $3)
     fi