diff --git a/nss/build.sh b/nss/build.sh
index 446488f3a..e974aca5c 100755
--- a/nss/build.sh
+++ b/nss/build.sh
@@ -15,17 +15,10 @@
 #
 ################################################################################
 
-cd /src/nss
-
-# Check out the code using mercurial.
-rm -rf nspr
-rm -rf nss
-hg clone https://hg.mozilla.org/projects/nspr
-hg clone https://hg.mozilla.org/projects/nss
-
 # Build the library.
 mkdir -p /work/nss
-cp -u -r /src/nss/* /work/nss/
+hg clone https://hg.mozilla.org/projects/nspr
+hg clone https://hg.mozilla.org/projects/nss
 cd /work/nss/nss
 make BUILD_OPT=1 USE_64=1 NSS_DISABLE_GTESTS=1 CC="$CC $CFLAGS" \
     CXX="$CXX $CXXFLAGS" LD="$CC $CFLAGS" ZDEFS_FLAG= clean nss_build_all