diff --git a/dist/main/index.js b/dist/main/index.js
index 633cacba..652f280b 100644
--- a/dist/main/index.js
+++ b/dist/main/index.js
@@ -7973,7 +7973,7 @@ async function registerPostBuildHook(cachixBin, daemonDir) {
       done | xargs
     }
 
-    if [[ -n $PUSH_FILTER ]]; then
+    if [ -n "$PUSH_FILTER" ]; then
       OUT_PATHS=$(filterPaths $PUSH_FILTER "$OUT_PATHS")
     fi
 
diff --git a/dist/main/push-paths.sh b/dist/main/push-paths.sh
index 977c8087..cecdd16b 100755
--- a/dist/main/push-paths.sh
+++ b/dist/main/push-paths.sh
@@ -12,10 +12,10 @@ function filterPaths {
   done | xargs
 }
 
-if [[ -z $pathsToPush ]]; then
+if [ -z "$pathsToPush" ]; then
     pathsToPush=$(comm -13 <(sort /tmp/store-path-pre-build) <("$(dirname "$0")"/list-nix-store.sh))
 
-    if [[ -n $pushFilter ]]; then
+    if [ -n "$pushFilter" ]; then
         pathsToPush=$(filterPaths $pushFilter "$pathsToPush")
     fi
 fi
diff --git a/src/main.ts b/src/main.ts
index 127f39ab..82598840 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -292,7 +292,7 @@ async function registerPostBuildHook(cachixBin: string, daemonDir: string) {
       done | xargs
     }
 
-    if [[ -n $PUSH_FILTER ]]; then
+    if [ -n "$PUSH_FILTER" ]; then
       OUT_PATHS=$(filterPaths $PUSH_FILTER "$OUT_PATHS")
     fi