diff --git a/src/Constants.ts b/src/Constants.ts
index e790a9d05..e02abedb1 100644
--- a/src/Constants.ts
+++ b/src/Constants.ts
@@ -7,7 +7,7 @@ export const CONSTANTS = {
   VersionString: "3.0.0dev",
   isDevBranch: true,
   isInTestEnvironment: globalThis.process?.env?.JEST_WORKER_ID !== undefined,
-  VersionNumber: 48,
+  VersionNumber: 49,
 
   /** Max level for any skill, assuming no multipliers. Determined by max numerical value in javascript for experience
    * and the skill level formula in Player.js. Note that all this means it that when experience hits MAX_INT, then
diff --git a/src/PersonObjects/Person.ts b/src/PersonObjects/Person.ts
index 741886f7d..c04468a1f 100644
--- a/src/PersonObjects/Person.ts
+++ b/src/PersonObjects/Person.ts
@@ -147,6 +147,10 @@ export abstract class Person implements IPerson {
   }
 
   overrideIntelligence(): void {
+    // Do not set anything if the player has not unlocked Intelligence.
+    if (Player.sourceFileLvl(5) === 0 && Player.bitNodeN !== 5) {
+      return;
+    }
     const persistentIntelligenceSkill = this.calculateSkill(this.persistentIntelligenceData.exp, 1);
     // Reset exp and skill to the persistent values if there is no limit (intelligenceOverride) or the limit is greater
     // than or equal to the persistent skill.
@@ -172,7 +176,7 @@ export abstract class Person implements IPerson {
      * Don't change sourceFileLvl to activeSourceFileLvl. When the player has int level, the ability to gain more int is
      * a permanent benefit.
      */
-    if (Player.sourceFileLvl(5) > 0 || this.skills.intelligence > 0 || Player.bitNodeN === 5) {
+    if (Player.sourceFileLvl(5) > 0 || Player.bitNodeN === 5) {
       this.exp.intelligence += exp;
       this.skills.intelligence = Math.floor(this.calculateSkill(this.exp.intelligence, 1));
       this.persistentIntelligenceData.exp += exp;
diff --git a/src/utils/SaveDataMigrationUtils.ts b/src/utils/SaveDataMigrationUtils.ts
index c8706aada..bfaf637f7 100644
--- a/src/utils/SaveDataMigrationUtils.ts
+++ b/src/utils/SaveDataMigrationUtils.ts
@@ -637,4 +637,11 @@ Error: ${e}`,
   if (ver < 48) {
     showAPIBreaks("3.0.0", breakingChanges300);
   }
+  if (ver < 49 && Player.sourceFileLvl(5) === 0 && Player.bitNodeN !== 5) {
+    for (const person of [Player, ...Player.sleeves]) {
+      person.persistentIntelligenceData.exp = 0;
+      person.exp.intelligence = 0;
+      person.skills.intelligence = 0;
+    }
+  }
 }
diff --git a/test/jest/Migration/Migration.test.ts b/test/jest/Migration/Migration.test.ts
index 7c2e06c3f..6d78f02c8 100644
--- a/test/jest/Migration/Migration.test.ts
+++ b/test/jest/Migration/Migration.test.ts
@@ -105,4 +105,31 @@ describe("v3", () => {
       `bitburnerSave_backup_2.8.1_${Math.round(lastUpdate / 1000)}.json.gz`,
     );
   });
+
+  describe("Intelligence migration bug", () => {
+    test("No change in exp and skill level", async () => {
+      const saveData = new Uint8Array(fs.readFileSync("test/jest/Migration/save-files/v2.8.1_SF1.1_SF10.3.gz"));
+      const mockedDownload = await loadGameFromSaveData(saveData);
+
+      for (const person of [Player, ...Player.sleeves]) {
+        expect(person.persistentIntelligenceData.exp).toStrictEqual(0);
+        expect(person.exp.intelligence).toStrictEqual(0);
+        expect(person.skills.intelligence).toStrictEqual(0);
+      }
+
+      expect(mockedDownload).toHaveBeenCalledWith(saveData, "bitburnerSave_backup_2.8.1_1776173824.json.gz");
+    });
+    test("Reset wrong exp and skill level", async () => {
+      const saveData = new Uint8Array(fs.readFileSync("test/jest/Migration/save-files/v3.0.0_int_migration_bug.gz"));
+      const mockedDownload = await loadGameFromSaveData(saveData);
+
+      for (const person of [Player, ...Player.sleeves]) {
+        expect(person.persistentIntelligenceData.exp).toStrictEqual(0);
+        expect(person.exp.intelligence).toStrictEqual(0);
+        expect(person.skills.intelligence).toStrictEqual(0);
+      }
+
+      expect(mockedDownload).not.toHaveBeenCalled();
+    });
+  });
 });
diff --git a/test/jest/Migration/save-files/v2.8.1_SF1.1_SF10.3.gz b/test/jest/Migration/save-files/v2.8.1_SF1.1_SF10.3.gz
new file mode 100644
index 000000000..9fd16cd45
Binary files /dev/null and b/test/jest/Migration/save-files/v2.8.1_SF1.1_SF10.3.gz differ
diff --git a/test/jest/Migration/save-files/v3.0.0_int_migration_bug.gz b/test/jest/Migration/save-files/v3.0.0_int_migration_bug.gz
new file mode 100644
index 000000000..c6ccca452
Binary files /dev/null and b/test/jest/Migration/save-files/v3.0.0_int_migration_bug.gz differ
diff --git a/test/jest/Netscript/Singularity.test.ts b/test/jest/Netscript/Singularity.test.ts
index e2c5b5925..bf457cbd0 100644
--- a/test/jest/Netscript/Singularity.test.ts
+++ b/test/jest/Netscript/Singularity.test.ts
@@ -55,8 +55,12 @@ function testIntelligenceOverride(
   setUpBeforePrestige = () => {},
 ): void {
   Player.sourceFiles.set(5, 1);
+  // The intelligence skill level starts at 0.
+  expect(Player.skills.intelligence).toStrictEqual(0);
+  prestigeSourceFile(true);
   // Start without exp.
   expect(Player.exp.intelligence).toStrictEqual(0);
+  // When having SF5 and the skill level is 0, it's set to 1.
   expect(Player.skills.intelligence).toStrictEqual(1);
   expect(Player.persistentIntelligenceData.exp).toStrictEqual(0);
   // Gain 1e6 exp (skill = 242).