diff --git a/src/writer/spirv/builder.cc b/src/writer/spirv/builder.cc
index 1928777..6f8032a 100644
--- a/src/writer/spirv/builder.cc
+++ b/src/writer/spirv/builder.cc
@@ -201,6 +201,9 @@
   if (expr->IsBinary()) {
     return GenerateBinaryExpression(expr->AsBinary());
   }
+  if (expr->IsCall()) {
+    return GenerateCallExpression(expr->AsCall());
+  }
   if (expr->IsConstructor()) {
     return GenerateConstructorExpression(expr->AsConstructor(), false);
   }