diff --git a/.changeset/mean-mice-tell.md b/.changeset/mean-mice-tell.md
new file mode 100644
index 0000000000..c01d618b7e
--- /dev/null
+++ b/.changeset/mean-mice-tell.md
@@ -0,0 +1,5 @@
+---
+"hardhat": patch
+---
+
+Fixed an issue that was causing build-info file names to not be deterministic.
diff --git a/packages/hardhat-core/src/internal/solidity/compiler/compiler-input.ts b/packages/hardhat-core/src/internal/solidity/compiler/compiler-input.ts
index 045b8633a8..e1f2cadcdc 100644
--- a/packages/hardhat-core/src/internal/solidity/compiler/compiler-input.ts
+++ b/packages/hardhat-core/src/internal/solidity/compiler/compiler-input.ts
@@ -4,7 +4,13 @@ export function getInputFromCompilationJob(
   compilationJob: CompilationJob
 ): CompilerInput {
   const sources: { [sourceName: string]: { content: string } } = {};
-  for (const file of compilationJob.getResolvedFiles()) {
+
+  // we sort the files so that we always get the same compilation input
+  const resolvedFiles = compilationJob
+    .getResolvedFiles()
+    .sort((a, b) => a.sourceName.localeCompare(b.sourceName));
+
+  for (const file of resolvedFiles) {
     sources[file.sourceName] = {
       content: file.content.rawContent,
     };
diff --git a/packages/hardhat-core/test/builtin-tasks/compile.ts b/packages/hardhat-core/test/builtin-tasks/compile.ts
index 0c5c120e27..3be4a6ea0b 100644
--- a/packages/hardhat-core/test/builtin-tasks/compile.ts
+++ b/packages/hardhat-core/test/builtin-tasks/compile.ts
@@ -1,4 +1,5 @@
 import { assert } from "chai";
+import ci from "ci-info";
 import * as fsExtra from "fs-extra";
 import * as path from "path";
 
@@ -817,4 +818,30 @@ Read about compiler configuration at https://hardhat.org/config
       });
     });
   });
+
+  describe("project where two contracts import the same dependency", function () {
+    useFixtureProject("consistent-build-info-names");
+    useEnvironment();
+
+    it("should always produce the same build-info name", async function () {
+      await this.env.run("compile");
+
+      const buildInfos = getBuildInfos();
+      assert.lengthOf(buildInfos, 1);
+
+      const expectedBuildInfoName = buildInfos[0];
+
+      const runs = ci.isCI ? 10 : 100;
+
+      for (let i = 0; i < runs; i++) {
+        await this.env.run("clean");
+        await this.env.run("compile");
+
+        const newBuildInfos = getBuildInfos();
+        assert.lengthOf(newBuildInfos, 1);
+
+        assert.equal(newBuildInfos[0], expectedBuildInfoName);
+      }
+    });
+  });
 });
diff --git a/packages/hardhat-core/test/fixture-projects/consistent-build-info-names/.gitignore b/packages/hardhat-core/test/fixture-projects/consistent-build-info-names/.gitignore
new file mode 100644
index 0000000000..e7f801166c
--- /dev/null
+++ b/packages/hardhat-core/test/fixture-projects/consistent-build-info-names/.gitignore
@@ -0,0 +1,2 @@
+artifacts/
+cache/
diff --git a/packages/hardhat-core/test/fixture-projects/consistent-build-info-names/contracts/A.sol b/packages/hardhat-core/test/fixture-projects/consistent-build-info-names/contracts/A.sol
new file mode 100644
index 0000000000..ad5f5e77cb
--- /dev/null
+++ b/packages/hardhat-core/test/fixture-projects/consistent-build-info-names/contracts/A.sol
@@ -0,0 +1,6 @@
+pragma solidity ^0.7.0;
+
+import "dependency/contracts/Dep1.sol";
+import "dependency/contracts/Dep2.sol";
+
+contract A {}
diff --git a/packages/hardhat-core/test/fixture-projects/consistent-build-info-names/contracts/B.sol b/packages/hardhat-core/test/fixture-projects/consistent-build-info-names/contracts/B.sol
new file mode 100644
index 0000000000..0289d130fc
--- /dev/null
+++ b/packages/hardhat-core/test/fixture-projects/consistent-build-info-names/contracts/B.sol
@@ -0,0 +1,5 @@
+pragma solidity ^0.7.0;
+
+import "dependency/contracts/Dep1.sol";
+
+contract B {}
diff --git a/packages/hardhat-core/test/fixture-projects/consistent-build-info-names/hardhat.config.js b/packages/hardhat-core/test/fixture-projects/consistent-build-info-names/hardhat.config.js
new file mode 100644
index 0000000000..38f2a55388
--- /dev/null
+++ b/packages/hardhat-core/test/fixture-projects/consistent-build-info-names/hardhat.config.js
@@ -0,0 +1,3 @@
+module.exports = {
+  solidity: "0.7.3",
+};
diff --git a/packages/hardhat-core/test/fixture-projects/consistent-build-info-names/node_modules/dependency/contracts/Dep1.sol b/packages/hardhat-core/test/fixture-projects/consistent-build-info-names/node_modules/dependency/contracts/Dep1.sol
new file mode 100644
index 0000000000..c3cbfee01f
--- /dev/null
+++ b/packages/hardhat-core/test/fixture-projects/consistent-build-info-names/node_modules/dependency/contracts/Dep1.sol
@@ -0,0 +1 @@
+pragma solidity ^0.7.0;
diff --git a/packages/hardhat-core/test/fixture-projects/consistent-build-info-names/node_modules/dependency/contracts/Dep2.sol b/packages/hardhat-core/test/fixture-projects/consistent-build-info-names/node_modules/dependency/contracts/Dep2.sol
new file mode 100644
index 0000000000..c3cbfee01f
--- /dev/null
+++ b/packages/hardhat-core/test/fixture-projects/consistent-build-info-names/node_modules/dependency/contracts/Dep2.sol
@@ -0,0 +1 @@
+pragma solidity ^0.7.0;
diff --git a/packages/hardhat-core/test/fixture-projects/consistent-build-info-names/node_modules/dependency/package.json b/packages/hardhat-core/test/fixture-projects/consistent-build-info-names/node_modules/dependency/package.json
new file mode 100644
index 0000000000..2c30dd0e49
--- /dev/null
+++ b/packages/hardhat-core/test/fixture-projects/consistent-build-info-names/node_modules/dependency/package.json
@@ -0,0 +1,4 @@
+{
+  "name": "dependency",
+  "version": "1.2.3"
+}