diff --git a/api/shim/shim.proto b/api/shim/shim.proto
index db48cc075..fb34ca511 100644
--- a/api/shim/shim.proto
+++ b/api/shim/shim.proto
@@ -13,7 +13,7 @@ service ShimService {
 }
 
 message PtyRequest {
-	string id = 1 [(gogoproto.customname) = "ID"];
+    string id = 1 [(gogoproto.customname) = "ID"];
     uint32 width = 2;
     uint32 height = 3;
 }