diff --git a/packages/aws-cdk-lib/aws-ec2/lib/instance-types.ts b/packages/aws-cdk-lib/aws-ec2/lib/instance-types.ts
index 33e7bc63d3847..c540f8498eb28 100644
--- a/packages/aws-cdk-lib/aws-ec2/lib/instance-types.ts
+++ b/packages/aws-cdk-lib/aws-ec2/lib/instance-types.ts
@@ -1534,7 +1534,7 @@ export class InstanceType {
   }
 
   public sameInstanceClassAs(other: InstanceType): boolean {
-    const instanceClass: RegExp = /^([a-z]+\d{1,2}[a-z]*)\.([a-z0-9]+)$/;
+    const instanceClass: RegExp = /^([a-z]+\d{1,2}[a-z\-]*)\.([a-z0-9\-]+)$/;
     const instanceClassId = this.instanceTypeIdentifier.match(instanceClass);
     const otherInstanceClassId = other.instanceTypeIdentifier.match(instanceClass);
     if (instanceClassId == null || otherInstanceClassId == null) {
diff --git a/packages/aws-cdk-lib/aws-ec2/test/instance.test.ts b/packages/aws-cdk-lib/aws-ec2/test/instance.test.ts
index 4c0516c655fb9..039ef7188179f 100644
--- a/packages/aws-cdk-lib/aws-ec2/test/instance.test.ts
+++ b/packages/aws-cdk-lib/aws-ec2/test/instance.test.ts
@@ -688,6 +688,24 @@ test('sameInstanceClassAs compares InstanceTypes correctly regardless of size',
   expect(largerInstanceType.sameInstanceClassAs(comparitor)).toBeTruthy();
 });
 
+test('sameInstanceClassAs compares InstanceTypes contains dashes', () => {
+  // GIVEN
+  const comparitor = InstanceType.of(InstanceClass.M7I_FLEX, InstanceSize.LARGE);
+  //WHEN
+  const largerInstanceType = InstanceType.of(InstanceClass.M7I_FLEX, InstanceSize.XLARGE);
+  //THEN
+  expect(largerInstanceType.sameInstanceClassAs(comparitor)).toBeTruthy();
+});
+
+test('sameInstanceClassAs compares InstanceSize contains dashes', () => {
+  // GIVEN
+  const comparitor = new InstanceType('m7a.metal-48xl');
+  //WHEN
+  const largerInstanceType = new InstanceType('m7a.xlarge');
+  //THEN
+  expect(largerInstanceType.sameInstanceClassAs(comparitor)).toBeTruthy();
+});
+
 test('sameInstanceClassAs compares different InstanceTypes correctly', () => {
   // GIVEN
   const comparitor = InstanceType.of(InstanceClass.C4, InstanceSize.LARGE);