diff --git a/lib/jasmine-core/jasmine.js b/lib/jasmine-core/jasmine.js
index 0bea85bb..40d5a8ad 100644
--- a/lib/jasmine-core/jasmine.js
+++ b/lib/jasmine-core/jasmine.js
@@ -3440,7 +3440,7 @@ getJasmineRequireObj().DelayedFunctionScheduler = function(j$) {
     this.scheduledLookup_ = [];
     this.scheduledFunctions_ = {};
     this.currentTime_ = 0;
-    this.delayedFnCount_ = 0;
+    this.delayedFnStartCount_ = 1e12; // arbitrarily large number to avoid collisions with native timer IDs;
     this.deletedKeys_ = [];
 
     this.tick = function(millis, tickDate) {
@@ -3472,7 +3472,7 @@ getJasmineRequireObj().DelayedFunctionScheduler = function(j$) {
       }
 
       millis = millis || 0;
-      timeoutKey = timeoutKey || ++this.delayedFnCount_;
+      timeoutKey = timeoutKey || ++this.delayedFnStartCount_;
       runAtMillis = runAtMillis || this.currentTime_ + millis;
 
       const funcToSchedule = {
diff --git a/spec/core/DelayedFunctionSchedulerSpec.js b/spec/core/DelayedFunctionSchedulerSpec.js
index 5175d3f5..09cf84c2 100644
--- a/spec/core/DelayedFunctionSchedulerSpec.js
+++ b/spec/core/DelayedFunctionSchedulerSpec.js
@@ -86,12 +86,13 @@ describe('DelayedFunctionScheduler', function() {
   it('increments scheduled fns ids unless one is passed', function() {
     const scheduler = new jasmineUnderTest.DelayedFunctionScheduler();
 
-    expect(scheduler.scheduleFunction(function() {}, 0)).toBe(1);
-    expect(scheduler.scheduleFunction(function() {}, 0)).toBe(2);
+    const initial = scheduler.scheduleFunction(function() {}, 0);
+    expect(scheduler.scheduleFunction(function() {}, 0)).toBe(initial + 1);
+    expect(scheduler.scheduleFunction(function() {}, 0)).toBe(initial + 2);
     expect(scheduler.scheduleFunction(function() {}, 0, [], false, 123)).toBe(
       123
     );
-    expect(scheduler.scheduleFunction(function() {}, 0)).toBe(3);
+    expect(scheduler.scheduleFunction(function() {}, 0)).toBe(initial + 3);
   });
 
   it('#removeFunctionWithId removes a previously scheduled function with a given id', function() {
@@ -313,6 +314,28 @@ describe('DelayedFunctionScheduler', function() {
     expect(tickDate).toHaveBeenCalledWith(1);
   });
 
+  it('does not conflict with native timer IDs', function() {
+    const NODE_JS =
+      typeof process !== 'undefined' &&
+      process.versions &&
+      typeof process.versions.node === 'string';
+    if (NODE_JS) {
+      pending('numeric timer ID conflicts only relevant for browsers.');
+    }
+    const nativeTimeoutId = setTimeout(function() {}, 100);
+
+    const scheduler = new jasmineUnderTest.DelayedFunctionScheduler();
+    const fn = jasmine.createSpy('fn');
+
+    for (let i = 0; i < nativeTimeoutId; i++) {
+      scheduler.scheduleFunction(fn, 0, [], false);
+    }
+    scheduler.removeFunctionWithId(nativeTimeoutId);
+    scheduler.tick(1);
+
+    expect(fn).toHaveBeenCalledTimes(nativeTimeoutId);
+  });
+
   describe('ticking inside a scheduled function', function() {
     let clock;
 
diff --git a/src/core/DelayedFunctionScheduler.js b/src/core/DelayedFunctionScheduler.js
index cca8ba46..8933866e 100644
--- a/src/core/DelayedFunctionScheduler.js
+++ b/src/core/DelayedFunctionScheduler.js
@@ -6,7 +6,7 @@ getJasmineRequireObj().DelayedFunctionScheduler = function(j$) {
     this.scheduledLookup_ = [];
     this.scheduledFunctions_ = {};
     this.currentTime_ = 0;
-    this.delayedFnCount_ = 0;
+    this.delayedFnStartCount_ = 1e12; // arbitrarily large number to avoid collisions with native timer IDs;
     this.deletedKeys_ = [];
 
     this.tick = function(millis, tickDate) {
@@ -38,7 +38,7 @@ getJasmineRequireObj().DelayedFunctionScheduler = function(j$) {
       }
 
       millis = millis || 0;
-      timeoutKey = timeoutKey || ++this.delayedFnCount_;
+      timeoutKey = timeoutKey || ++this.delayedFnStartCount_;
       runAtMillis = runAtMillis || this.currentTime_ + millis;
 
       const funcToSchedule = {