diff --git a/src/libraries/System.Runtime/tests/System/Type/TypeTests.Get.cs b/src/libraries/System.Runtime/tests/System/Type/TypeTests.Get.cs
index 5f19479bc6211..124687962d0f0 100644
--- a/src/libraries/System.Runtime/tests/System/Type/TypeTests.Get.cs
+++ b/src/libraries/System.Runtime/tests/System/Type/TypeTests.Get.cs
@@ -91,6 +91,12 @@ public void GetInterface_MixedCaseAmbiguity_ThrowsAmbiguousMatchException()
         {
             Assert.Throws<AmbiguousMatchException>(() => typeof(ClassWithMixedCaseInterfaces).GetInterface("mixedinterface", ignoreCase: true));
         }
+
+        [Fact]
+        public void GetCustomAttributes_Interface()
+        {
+            Assert.True(typeof(ExampleWithAttribute).GetCustomAttributes(typeof(INameable), inherit: false)[0] is NameableAttribute);
+        }
     }
 
     public class ClassWithNoInterfaces { }
@@ -116,6 +122,20 @@ public interface Interface1 { }
         public interface Interface2 { }
         public interface Interface3 { }
     }
+
+    public interface INameable
+    {
+        string Name { get; }
+    }
+
+    [AttributeUsage (AttributeTargets.All, AllowMultiple=true)]
+    public class NameableAttribute : Attribute, INameable
+    {
+        string INameable.Name => "Nameable";
+    }
+
+    [Nameable]
+    public class ExampleWithAttribute { }
 }
 
 public interface Interface1 { }
diff --git a/src/mono/netcore/System.Private.CoreLib/src/System/Reflection/CustomAttribute.cs b/src/mono/netcore/System.Private.CoreLib/src/System/Reflection/CustomAttribute.cs
index 3fde27fb5335c..cc141613b5e11 100644
--- a/src/mono/netcore/System.Private.CoreLib/src/System/Reflection/CustomAttribute.cs
+++ b/src/mono/netcore/System.Private.CoreLib/src/System/Reflection/CustomAttribute.cs
@@ -140,7 +140,8 @@ internal static object[] GetCustomAttributes(ICustomAttributeProvider obj, Type
                 throw new ArgumentNullException(nameof(obj));
             if (attributeType == null)
                 throw new ArgumentNullException(nameof(attributeType));
-            if (!attributeType.IsSubclassOf(typeof(Attribute)) && attributeType != typeof(Attribute) && attributeType != typeof(CustomAttribute) && attributeType != typeof(object))
+            if (!attributeType.IsSubclassOf(typeof(Attribute)) && !attributeType.IsInterface
+                && attributeType != typeof(Attribute) && attributeType != typeof(CustomAttribute) && attributeType != typeof(object))
                 throw new ArgumentException(SR.Argument_MustHaveAttributeBaseClass + " " + attributeType.FullName);
 
             if (attributeType == typeof(CustomAttribute))