diff --git a/src/codegen/c.zig b/src/codegen/c.zig
index bea3c02985b6e3c5ba6568539cad31bae39aae75..330a9b33e89bc2954fcf5e9e621c72d188cf851b 100644
--- a/src/codegen/c.zig
+++ b/src/codegen/c.zig
@@ -4285,7 +4285,7 @@ fn airBlock(f: *Function, inst: Air.Inst.Index) !CValue {
     const writer = f.object.writer();
 
     const inst_ty = f.typeOfIndex(inst);
-    const result = if (inst_ty.ip_index != .void_type and !f.liveness.isUnused(inst))
+    const result = if (inst_ty.hasRuntimeBitsIgnoreComptime(mod) and !f.liveness.isUnused(inst))
         try f.allocLocal(inst, inst_ty)
     else
         .none;