diff --git a/Lib/go/goruntime.swg b/Lib/go/goruntime.swg
index f27bbae5e..4b7daf41f 100644
--- a/Lib/go/goruntime.swg
+++ b/Lib/go/goruntime.swg
@@ -16,14 +16,17 @@
 #if SWIGGO_INTGO_SIZE == 32
 %insert(runtime) %{
 typedef int intgo;
+typedef unsigned int uintgo;
 %}
 #elif SWIGGO_INTGO_SIZE == 64
 %insert(runtime) %{
 typedef long long intgo;
+typedef unsigned long long uintgo;
 %}
 #else
 %insert(runtime) %{
 typedef ptrdiff_t intgo;
+typedef size_t uintgo;
 %}
 #endif