diff --git a/Makefile b/Makefile
index 32f6a95..ea24452 100644
--- a/Makefile
+++ b/Makefile
@@ -1,9 +1,9 @@
 ########## Variablendefinitionen ###########
 
 # ist subversion verfuegbar?
-IS_SVN := $(shell test -d .svn && which svn && echo "yes")
+IS_SVN := $(shell test -d .svn && which svn >/dev/null && echo "yes")
 # Revisions-Variablen
-REVISIONS_NR := $(shell test "yes" = "$(IS_SVN)" && svn -R info | grep ^Revision | cut -f2 -d " " | sort | tail -1)
+REVISIONS_NR := $(shell test "yes" = "$(IS_SVN)" && svn -R info | grep ^Revision | cut -f2 -d " " | sort -n | tail -1)
 # kein svn vorhanden? also nehmen wir das heutige Datum
 REVISIONS_NR ?= $(shell date +%Y%m%d)
 REVISIONS_SUFFIX = _r$(REVISIONS_NR)