diff --git a/scripts/setup-genomes.sh b/scripts/setup-genomes.sh
index b8a7863..777f51d 100644
--- a/scripts/setup-genomes.sh
+++ b/scripts/setup-genomes.sh
@@ -30,7 +30,7 @@ for entry in "${GENOMES[@]}"; do
 
     GENOME_PATH="${WORK_DIR}/${MASTER_REPO}/${GENOME_NAME}"
 
-    if [ ! -d "${GENOME_PATH}" ]; then
+    if [[ ! -d "${GENOME_PATH}" ]]; then
         cd "${WORK_DIR}/${MASTER_REPO}"
         info "Linking ${GENOME_NAME} as a submodule..."
 
diff --git a/scripts/setup-master.sh b/scripts/setup-master.sh
index 42c3e1a..181c01e 100644
--- a/scripts/setup-master.sh
+++ b/scripts/setup-master.sh
@@ -19,7 +19,7 @@ provider_create_repo "${MASTER_REPO}" "Knowledge Genome Master Repository" "true
 mkdir -p "${WORK_DIR}/${MASTER_REPO}"
 cd "${WORK_DIR}/${MASTER_REPO}"
 
-if [ ! -d ".git" ]; then
+if [[ ! -d ".git" ]]; then
     info "Initializing Git in Master repository..."
     git init
 
@@ -27,7 +27,7 @@ if [ ! -d ".git" ]; then
     SSH_URL=$(provider_ssh_url "${MASTER_REPO}")
     git remote add origin "${SSH_URL}"
 
-    if [ -n "${GIST_URL:-}" ]; then
+    if [[ -n "${GIST_URL:-}" ]]; then
         info "Adding core-karpathy as an external reference..."
         git submodule add "${GIST_URL}" core-karpathy || warn "Could not add core-karpathy submodule."
     fi