diff --git a/dist/restore/index.js b/dist/restore/index.js
index f8069d3..e1550d8 100644
--- a/dist/restore/index.js
+++ b/dist/restore/index.js
@@ -59597,8 +59597,19 @@ async function getCargoBins() {
 }
 function getEnvKey() {
     const hasher = external_crypto_default().createHash("sha1");
+    const validKeys = [
+        /^CARGO_.+$/,
+        /^CC_.+$/,
+        /^CXX_.+$/,
+        /^RUSTC_.+$/,
+        /^RUSTC$/,
+        /^RUSTDOC$/,
+        /^RUSTDOCFLAGS$/,
+        /^RUSTFLAGS$/,
+        /^RUSTFMT$/,
+    ];
     for (const [key, value] of Object.entries(process.env)) {
-        if (value) {
+        if (validKeys.some((re) => re.test(key)) && value) {
             hasher.update(`${key}=${value}`);
         }
     }
diff --git a/dist/save/index.js b/dist/save/index.js
index be0df7c..2ca6491 100644
--- a/dist/save/index.js
+++ b/dist/save/index.js
@@ -59597,8 +59597,19 @@ async function getCargoBins() {
 }
 function getEnvKey() {
     const hasher = external_crypto_default().createHash("sha1");
+    const validKeys = [
+        /^CARGO_.+$/,
+        /^CC_.+$/,
+        /^CXX_.+$/,
+        /^RUSTC_.+$/,
+        /^RUSTC$/,
+        /^RUSTDOC$/,
+        /^RUSTDOCFLAGS$/,
+        /^RUSTFLAGS$/,
+        /^RUSTFMT$/,
+    ];
     for (const [key, value] of Object.entries(process.env)) {
-        if (value) {
+        if (validKeys.some((re) => re.test(key)) && value) {
             hasher.update(`${key}=${value}`);
         }
     }
diff --git a/src/common.ts b/src/common.ts
index 83ba944..63236b9 100644
--- a/src/common.ts
+++ b/src/common.ts
@@ -108,8 +108,20 @@ export async function getCargoBins(): Promise<Set<string>> {
 
 function getEnvKey(): string {
   const hasher = crypto.createHash("sha1");
+  const validKeys = [
+    /^CARGO_.+$/,
+    /^CC_.+$/,
+    /^CXX_.+$/,
+    /^RUSTC_.+$/,
+    /^RUSTC$/,
+    /^RUSTDOC$/,
+    /^RUSTDOCFLAGS$/,
+    /^RUSTFLAGS$/,
+    /^RUSTFMT$/,
+  ];
+
   for (const [key, value] of Object.entries(process.env)) {
-    if (value) {
+    if (validKeys.some((re) => re.test(key)) && value) {
       hasher.update(`${key}=${value}`);
     }
   }