diff --git a/tools/osx-bundle.sh b/tools/osx-bundle.sh
index a1563a481..29e0fbfd9 100755
--- a/tools/osx-bundle.sh
+++ b/tools/osx-bundle.sh
@@ -61,10 +61,12 @@ echo "---- Copying dictionaries ----"
 if test -f "${DICT_DIR}"; then
   cp -v "${DICT_DIR}/*" "${PKG_DIR}/Contents/SharedSupport/dictionaries"
 else
-  echo "Specified dictionary directory ${DICT_DIR} not found. Downloading dictionaries:"
-  mkdir "${BUILD_DIR}/dictionaries"
-  curl -L "https://downloads.sourceforge.net/project/openofficeorg.mirror/contrib/dictionaries/en_US.zip" -o "${BUILD_DIR}/dictionaries/en_US.zip"
-  unzip "${BUILD_DIR}/dictionaries/en_US.zip" -d "${BUILD_DIR}/dictionaries"
+  mkdir -p "${BUILD_DIR}/dictionaries"
+  if ! test -f "${BUILD_DIR}/dictionaries/en_US.aff"; then
+      echo "Specified dictionary directory ${DICT_DIR} not found. Downloading dictionaries:"
+      curl -L "https://downloads.sourceforge.net/project/openofficeorg.mirror/contrib/dictionaries/en_US.zip" -o "${BUILD_DIR}/dictionaries/en_US.zip"
+      unzip "${BUILD_DIR}/dictionaries/en_US.zip" -d "${BUILD_DIR}/dictionaries"
+  fi
   cp -v "${BUILD_DIR}/dictionaries/en_US.aff" "${PKG_DIR}/Contents/SharedSupport/dictionaries"
   cp -v "${BUILD_DIR}/dictionaries/en_US.dic" "${PKG_DIR}/Contents/SharedSupport/dictionaries"
 fi