diff --git a/dist/index.js b/dist/index.js
index 59e134b2..5e1657ed 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -147263,12 +147263,19 @@ async function checkAptInstallability(packageName) {
         "--names-only",
         `'^${packageName}$'`,
     ]);
-    return output.stdout.length !== 0;
+    return output.stdout.length > 0;
 }
 async function retrieveInstallableOptionalDependencies(optionalDependencies) {
     switch (PLATFORM) {
         case "linux": {
-            return optionalDependencies.filter(async (dep) => await checkAptInstallability(dep));
+            const installableOptionalDependencies = [];
+            for (const optionalDependency of optionalDependencies) {
+                const isInstallable = await checkAptInstallability(optionalDependency);
+                if (isInstallable) {
+                    installableOptionalDependencies.push(optionalDependency);
+                }
+            }
+            return installableOptionalDependencies;
         }
         default: {
             return [];
diff --git a/packages/setup-ocaml/src/unix.ts b/packages/setup-ocaml/src/unix.ts
index 8a7a1d9f..abb58704 100644
--- a/packages/setup-ocaml/src/unix.ts
+++ b/packages/setup-ocaml/src/unix.ts
@@ -9,7 +9,7 @@ async function checkAptInstallability(packageName: string) {
     "--names-only",
     `'^${packageName}$'`,
   ]);
-  return output.stdout.length !== 0;
+  return output.stdout.length > 0;
 }
 
 async function retrieveInstallableOptionalDependencies(
@@ -17,9 +17,14 @@ async function retrieveInstallableOptionalDependencies(
 ) {
   switch (PLATFORM) {
     case "linux": {
-      return optionalDependencies.filter(
-        async (dep) => await checkAptInstallability(dep),
-      );
+      const installableOptionalDependencies: string[] = [];
+      for (const optionalDependency of optionalDependencies) {
+        const isInstallable = await checkAptInstallability(optionalDependency);
+        if (isInstallable) {
+          installableOptionalDependencies.push(optionalDependency);
+        }
+      }
+      return installableOptionalDependencies;
     }
     default: {
       return [];