diff --git a/support/scripts/setlocalversion b/support/scripts/setlocalversion
index 45f4283bb1..b39b751f03 100755
--- a/support/scripts/setlocalversion
+++ b/support/scripts/setlocalversion
@@ -53,7 +53,7 @@ if head=`git rev-parse --verify --short HEAD 2>/dev/null`; then
 fi
 
 # Check for mercurial and a mercurial repo.
-if hgid=`hg id --id --tags 2>/dev/null`; then
+if hgid=`HGRCPATH= hg id --id --tags 2>/dev/null`; then
 	tag=`printf '%s' "$hgid" | cut -d' ' -f2 --only-delimited`
 
 	# Do we have an untagged version?