diff --git a/src/AnimGraphResource.cc b/src/AnimGraphResource.cc
index 40c0c3a..84ce576 100644
--- a/src/AnimGraphResource.cc
+++ b/src/AnimGraphResource.cc
@@ -16,31 +16,12 @@ using json = nlohmann::json;
 // Socket <-> json
 //
 std::string sSocketTypeToStr(SocketType pin_type) {
-  std::string result = "unknown";
-  switch (pin_type) {
-    case SocketType::SocketTypeBool:
-      result = "Bool";
-      break;
-    case SocketType::SocketTypeAnimation:
-      result = "Animation";
-      break;
-    case SocketType::SocketTypeFloat:
-      result = "Float";
-      break;
-    case SocketType::SocketTypeVec3:
-      result = "Vec3";
-      break;
-    case SocketType::SocketTypeQuat:
-      result = "Quat";
-      break;
-    case SocketType::SocketTypeString:
-      result = "String";
-      break;
-    default:
-      result = "Unknown";
+  if (pin_type < SocketType::SocketTypeUndefined
+      || pin_type >= SocketType::SocketTypeLast) {
+    return "Unknown";
   }
 
-  return result;
+  return SocketTypeNames[static_cast<int>(pin_type)];
 }
 
 json sSocketToJson(const Socket& socket) {
diff --git a/src/AnimGraphResource.h b/src/AnimGraphResource.h
index ac0e96f..18471ec 100644
--- a/src/AnimGraphResource.h
+++ b/src/AnimGraphResource.h
@@ -49,13 +49,18 @@ SplitOutputAttributeId(int attribute_id, int* node_id, int* output_index) {
 
 
 enum class SocketType {
-  SocketTypeUndefined,
+  SocketTypeUndefined = 0,
   SocketTypeBool,
   SocketTypeAnimation,
   SocketTypeFloat,
   SocketTypeVec3,
   SocketTypeQuat,
-  SocketTypeString
+  SocketTypeString,
+  SocketTypeLast
+};
+
+static const char* SocketTypeNames[] = {
+    "", "Bool", "Animation", "Float", "Vec3", "Quat", "String"
 };
 
 enum SocketFlags { SocketFlagAffectsTime = 1 };