diff --git a/SheepShaver/src/Unix/configure.ac b/SheepShaver/src/Unix/configure.ac
index 749ebdff..02b7fb30 100755
--- a/SheepShaver/src/Unix/configure.ac
+++ b/SheepShaver/src/Unix/configure.ac
@@ -29,7 +29,7 @@ case $target_os in
 esac
 
 dnl Options.
-AC_ARG_ENABLE(jit,          [  --enable-jit            enable JIT compiler [default=yes]], [WANT_JIT=$enableval], [WANT_JIT=yes])
+AC_ARG_ENABLE(jit,          [  --enable-jit            enable JIT compiler [default=no]], [WANT_JIT=$enableval], [WANT_JIT=no])
 AC_ARG_ENABLE(ppc-emulator, [  --enable-ppc-emulator   use the selected PowerPC emulator [default=auto]], [WANT_EMULATED_PPC=$enableval], [WANT_EMULATED_PPC=auto])
 AC_ARG_ENABLE(fbdev-dga,    [  --enable-fbdev-dga      use direct frame buffer access via /dev/fb0 [default=yes]], [WANT_FBDEV_DGA=$enableval], [WANT_FBDEV_DGA=yes])
 AC_ARG_ENABLE(xf86-dga,     [  --enable-xf86-dga       use the XFree86 DGA extension [default=yes]], [WANT_XF86_DGA=$enableval], [WANT_XF86_DGA=yes])
@@ -57,13 +57,13 @@ AC_ARG_WITH(libvhd,
 
 dnl Addressing mode
 AC_ARG_ENABLE(addressing,
-  [  --enable-addressing=AM  set the addressing mode to use [default=real]],
+  [  --enable-addressing=AM  set the addressing mode to use [default=direct]],
   [case "$enableval" in
    real)        WANT_ADDRESSING_MODE="real";;
    direct)      WANT_ADDRESSING_MODE="direct";;
    direct,0x*)  WANT_ADDRESSING_MODE="direct"; NATMEM_OFFSET=`echo "$enableval" | sed -n '/direct,\(0[[xX]][[0-9A-Fa-f]]*\([[UuLl]]\{1,2\}\)\?\)$/s//\1/p'`;;
    esac],
-  [WANT_ADDRESSING_MODE="real"]
+  [WANT_ADDRESSING_MODE="direct"]
 )
 
 dnl SDL options.