diff --git a/elab_scope.cc b/elab_scope.cc
index 6c907c139..926e62efb 100644
--- a/elab_scope.cc
+++ b/elab_scope.cc
@@ -924,7 +924,7 @@ bool PGenerate::generate_scope_loop_(Design*des, NetScope*container)
       }
 
 	// We're going to need a genvar...
-      int genvar;
+      long genvar;
 
 	// The initial value for the genvar does not need (nor can it
 	// use) the genvar itself, so we can evaluate this expression