diff --git a/guess-rev.sh b/guess-rev.sh
index c561be56e..aee6770df 100755
--- a/guess-rev.sh
+++ b/guess-rev.sh
@@ -3,7 +3,6 @@
 
 REV=unknown
 
-which svnversion > /dev/null 2>&1 && REV=`svnversion -n`
+which svnversion > /dev/null 2>&1 && REV=`svnversion -n "$1"`
 
 echo -n $REV
-
diff --git a/src/Makefile.am b/src/Makefile.am
index 30b67f269..a49957948 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -21,7 +21,7 @@ openocd_CPPFLAGS = \
 if RELEASE
 openocd_CPPFLAGS += -DRELSTR=\"Release\" -DPKGBLDREV=\"\"
 else
-openocd_CPPFLAGS += -DRELSTR=\"svn:\" -DPKGBLDREV=\"`$(top_srcdir)/guess-rev.sh`\"
+openocd_CPPFLAGS += -DRELSTR=\"svn:\" -DPKGBLDREV=\"`$(top_srcdir)/guess-rev.sh $(top_srcdir)`\"
 endif
 
 # add default CPPFLAGS