diff --git a/Dapper.Contrib.Tests/Tests.cs b/Dapper.Contrib.Tests/Tests.cs
index 908c648038808e128676d59ac03c84d167addd65..7ac6172b16f0e31f2b3fde655c467b739e1ef75b 100644
--- a/Dapper.Contrib.Tests/Tests.cs
+++ b/Dapper.Contrib.Tests/Tests.cs
@@ -153,6 +153,19 @@ public void InsertGetUpdateDeleteWithExplicitKey()
             }
         }
 
+        public void GetAllWithExplicitKey()
+        {
+            using (var connection = GetOpenConnection())
+            {
+                var guid = Guid.NewGuid().ToString();
+                var o1 = new ObjectX { ObjectXId = guid, Name = "Foo" };
+                connection.Insert(o1);
+
+                var objectXs = connection.GetAll<ObjectX>();
+                objectXs.Count().IsEqualTo(1);
+            }
+        }
+
         public void ShortIdentity()
         {
             using (var connection = GetOpenConnection())
diff --git a/Dapper.Contrib/SqlMapperExtensions.cs b/Dapper.Contrib/SqlMapperExtensions.cs
index e318bafa72bc9eadaf7fcf14455b67ffca2c5be0..3fd7caa6472d56e1790aefdaf9825ec98bab1c1e 100644
--- a/Dapper.Contrib/SqlMapperExtensions.cs
+++ b/Dapper.Contrib/SqlMapperExtensions.cs
@@ -201,10 +201,11 @@ private static bool IsWriteable(PropertyInfo pi)
             if (!GetQueries.TryGetValue(cacheType.TypeHandle, out sql))
             {
                 var keys = KeyPropertiesCache(type);
-                if (keys.Count() > 1)
-                    throw new DataException("Get<T> only supports an entity with a single [Key] property");
-                if (!keys.Any())
-                    throw new DataException("Get<T> only supports en entity with a [Key] property");
+                var explicitKeys = ExplicitKeyPropertiesCache(type);
+                if (keys.Count() > 1 || explicitKeys.Count() > 1)
+                    throw new DataException("Get<T> only supports an entity with a single [Key] or [ExplicitKey] property");
+                if (!keys.Any() && !explicitKeys.Any())
+                    throw new DataException("Get<T> only supports an entity with a [Key] or an [ExplicitKey] property");
 
                 var name = GetTableName(type);