diff --git a/src/QsCompiler/Compiler/RewriteSteps/ClassicallyControlled.cs b/src/QsCompiler/Compiler/RewriteSteps/ClassicallyControlled.cs
index cbd1a86cf5..bf96092f2b 100644
--- a/src/QsCompiler/Compiler/RewriteSteps/ClassicallyControlled.cs
+++ b/src/QsCompiler/Compiler/RewriteSteps/ClassicallyControlled.cs
@@ -10,12 +10,12 @@
 namespace Microsoft.Quantum.QsCompiler.BuiltInRewriteSteps
 {
     /// <summary>
-    /// Replaces if-statements with the corresponding calls to built-in quantum operations if possible. 
+    /// Replaces if-statements with the corresponding calls to built-in quantum operations if possible.
     /// </summary>
     internal class ClassicallyControlled : IRewriteStep
     {
         public string Name => "Classically Controlled";
-        public int Priority => RewriteStepPriorities.ControlFlowSubstitutions; 
+        public int Priority => RewriteStepPriorities.ControlFlowSubstitutions;
         public IDictionary<string, string> AssemblyConstants { get; }
         public IEnumerable<IRewriteStep.Diagnostic> GeneratedDiagnostics => null;
 
@@ -44,6 +44,8 @@ public bool PreconditionVerification(QsCompilation compilation)
                 .ToHashSet();
             var requiredBuiltIns = new HashSet<QsQualifiedName>()
             {
+                BuiltIn.NoOp.FullName,
+
                 BuiltIn.ApplyIfZero.FullName,
                 BuiltIn.ApplyIfZeroA.FullName,
                 BuiltIn.ApplyIfZeroC.FullName,