diff --git a/acinclude.m4 b/acinclude.m4
index 521b1801435d0f6de6b280f8b23864d763e17b18..0de18fc10568ceeb257aecd957b37ad15ba22b23 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -90,8 +90,8 @@ AC_DEFUN(
       if test -z "$a" ; then continue ; fi ;
       if ( sh -c "$a --version" 2> /dev/null | grep GNU  2>&1 > /dev/null ) ;  then
          GNU_MAKE=$a ;
-	 GNU_MAKE_VERSION_MAJOR=`$GNU_MAKE --version | grep "GNU Make" | cut -f3 -d' ' | cut -f1 -d'.'`
-	 GNU_MAKE_VERSION_MINOR=`$GNU_MAKE --version | grep "GNU Make" | cut -f2 -d'.'`
+         GNU_MAKE_VERSION_MAJOR=`$GNU_MAKE --version | grep "GNU Make" | cut -f3 -d' ' | cut -f1 -d'.'`
+         GNU_MAKE_VERSION_MINOR=`$GNU_MAKE --version | grep "GNU Make" | cut -f2 -d'.'`
          break;
       fi
    done ;