diff --git a/localize.sh b/localize.sh
index d5b147126..88e2413db 100755
--- a/localize.sh
+++ b/localize.sh
@@ -2,9 +2,9 @@
 UNAME=$(uname -s)
 export CURRENT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 if [ ${UNAME} = 'Darwin' ]; then
-    export DYLD_LIBRARY_PATH="${CURRENT_DIR}/src/"
+    export DYLD_LIBRARY_PATH="${CURRENT_DIR}/src/":${DYLD_LIBRARY_PATH}
 else
-    export LD_LIBRARY_PATH="${CURRENT_DIR}/src/"
+    export LD_LIBRARY_PATH="${CURRENT_DIR}/src/":${LD_LIBRARY_PATH}
 fi
 export PYTHONPATH="${CURRENT_DIR}/bindings/python/":$PYTHONPATH
 export MAPNIK_FONT_DIRECTORY="${CURRENT_DIR}/fonts/dejavu-fonts-ttf-2.33/ttf/"