diff --git a/src/main/kotlin/uk/gibby/neo4k/returns/multiple/MultipleReturn2.kt b/src/main/kotlin/uk/gibby/neo4k/returns/multiple/MultipleReturn2.kt
index ad9e8a9..1311cde 100644
--- a/src/main/kotlin/uk/gibby/neo4k/returns/multiple/MultipleReturn2.kt
+++ b/src/main/kotlin/uk/gibby/neo4k/returns/multiple/MultipleReturn2.kt
@@ -25,7 +25,7 @@ data class MultipleReturn2<a, A: ReturnValue<a>, b, B: ReturnValue<b>>(val first
                 }
             }
             composite.endStructure(descriptor)
-            return f!! to s!!
+            return f as a to s as b
         }
 
         override fun serialize(encoder: Encoder, value: Pair<a, b>) {
diff --git a/src/main/kotlin/uk/gibby/neo4k/returns/multiple/MultipleReturn3.kt b/src/main/kotlin/uk/gibby/neo4k/returns/multiple/MultipleReturn3.kt
index 6219ea8..bca6751 100644
--- a/src/main/kotlin/uk/gibby/neo4k/returns/multiple/MultipleReturn3.kt
+++ b/src/main/kotlin/uk/gibby/neo4k/returns/multiple/MultipleReturn3.kt
@@ -28,7 +28,7 @@ data class MultipleReturn3<a, A: ReturnValue<a>, b, B: ReturnValue<b>, c, C: Ret
                     }
                 }
                 composite.endStructure(descriptor)
-                return Triple(f!!, s!!, t!!)
+                return Triple(f as a, s as b, t as c)
             }
 
             override fun serialize(encoder: Encoder, value: Triple<a, b, c>) {
diff --git a/src/main/kotlin/uk/gibby/neo4k/returns/multiple/MultipleReturn4.kt b/src/main/kotlin/uk/gibby/neo4k/returns/multiple/MultipleReturn4.kt
index b459dc8..0286188 100644
--- a/src/main/kotlin/uk/gibby/neo4k/returns/multiple/MultipleReturn4.kt
+++ b/src/main/kotlin/uk/gibby/neo4k/returns/multiple/MultipleReturn4.kt
@@ -30,7 +30,7 @@ data class MultipleReturn4<a,  A: ReturnValue<a>, b, B: ReturnValue<b>, c, C: Re
                     }
                 }
                 composite.endStructure(descriptor)
-                return Vec(p1!!, p2!!, p3!!, p4!!)
+                return Vec(p1 as a, p2 as b, p3 as c, p4 as d)
             }
 
             override fun serialize(encoder: Encoder, value: Vec<a, b, c, d>) {
diff --git a/src/main/kotlin/uk/gibby/neo4k/returns/multiple/MultipleReturn5.kt b/src/main/kotlin/uk/gibby/neo4k/returns/multiple/MultipleReturn5.kt
index 8f6c35c..8c51779 100644
--- a/src/main/kotlin/uk/gibby/neo4k/returns/multiple/MultipleReturn5.kt
+++ b/src/main/kotlin/uk/gibby/neo4k/returns/multiple/MultipleReturn5.kt
@@ -32,7 +32,7 @@ data class MultipleReturn5<a,  A: ReturnValue<a>, b, B: ReturnValue<b>, c, C: Re
                     }
                 }
                 composite.endStructure(descriptor)
-                return Vec(p1!!, p2!!, p3!!, p4!!, p5!!)
+                return Vec(p1 as a, p2 as b, p3 as c, p4 as d, p5 as e)
             }
 
             override fun serialize(encoder: Encoder, value: Vec<a, b, c, d, e>) {