diff --git a/src/phases/attempt-run-phase.ts b/src/phases/attempt-run-phase.ts
index 4cd6bcc2740..553c9899db9 100644
--- a/src/phases/attempt-run-phase.ts
+++ b/src/phases/attempt-run-phase.ts
@@ -14,6 +14,9 @@ export class AttemptRunPhase extends PokemonPhase {
     super(scene, fieldIndex);
   }
 
+  /** For testing purposes: this is to force the pokemon to fail and escape */
+  public forceFailEscape = false;
+
   start() {
     super.start();
 
@@ -28,7 +31,7 @@ export class AttemptRunPhase extends PokemonPhase {
 
     applyAbAttrs(RunSuccessAbAttr, playerPokemon, null, false, escapeChance);
 
-    if (playerPokemon.randSeedInt(100) < escapeChance.value) {
+    if (playerPokemon.randSeedInt(100) < escapeChance.value && !this.forceFailEscape) {
       this.scene.playSound("se/flee");
       this.scene.queueMessage(i18next.t("battle:runAwaySuccess"), null, true, 500);
 
diff --git a/src/test/abilities/speed_boost.test.ts b/src/test/abilities/speed_boost.test.ts
index 72564e0db87..d801e68b3ca 100644
--- a/src/test/abilities/speed_boost.test.ts
+++ b/src/test/abilities/speed_boost.test.ts
@@ -5,6 +5,9 @@ import { Species } from "#enums/species";
 import GameManager from "#test/utils/gameManager";
 import Phaser from "phaser";
 import { afterEach, beforeAll, beforeEach, describe, expect, it } from "vitest";
+import { CommandPhase } from "#app/phases/command-phase";
+import { Command } from "#app/ui/command-ui-handler";
+import { AttemptRunPhase } from "#app/phases/attempt-run-phase";
 
 describe("Abilities - Speed Boost", () => {
   let phaserGame: Phaser.Game;
@@ -96,6 +99,26 @@ describe("Abilities - Speed Boost", () => {
       const playerPokemon = game.scene.getPlayerPokemon()!;
       expect(playerPokemon.getStatStage(Stat.SPD)).toBe(0);
 
+      game.move.select(Moves.SPLASH);
+      await game.toNextTurn();
+      expect(playerPokemon.getStatStage(Stat.SPD)).toBe(1);
+    });
+
+  it("should not trigger if pokemon fails to escape",
+    async () => {
+      game.override.enemySpecies(Species.REGIELEKI);
+      await game.classicMode.startBattle([ Species.SHUCKLE ]);
+
+      const commandPhase = game.scene.getCurrentPhase() as CommandPhase;
+      commandPhase.handleCommand(Command.RUN, 0);
+      const runPhase = game.scene.getCurrentPhase() as AttemptRunPhase;
+      runPhase.forceFailEscape = true;
+      await game.phaseInterceptor.to(AttemptRunPhase);
+      await game.toNextTurn();
+
+      const playerPokemon = game.scene.getPlayerPokemon()!;
+      expect(playerPokemon.getStatStage(Stat.SPD)).toBe(0);
+
       game.move.select(Moves.SPLASH);
       await game.toNextTurn();
       expect(playerPokemon.getStatStage(Stat.SPD)).toBe(1);