diff --git a/ExpressionEngine/FlowRunnerDependencyExtension.cs b/ExpressionEngine/FlowRunnerDependencyExtension.cs
index da3ecaf..0df53cc 100644
--- a/ExpressionEngine/FlowRunnerDependencyExtension.cs
+++ b/ExpressionEngine/FlowRunnerDependencyExtension.cs
@@ -19,6 +19,7 @@ public static void AddExpressionEngine(this IServiceCollection services)
             AddStringFunctions(services);
             AddCollectionFunction(services);
             AddConversionFunction(services);
+            AddLogicalComparisonFunctions(services);
 
             services.AddTransient<IFunction, LengthFunction>();
             services.AddTransient<IFunction, GreaterFunction>();
@@ -68,5 +69,18 @@ private static void AddConversionFunction(IServiceCollection services)
             services.AddTransient<IFunction, DataUriFunction>();
             services.AddTransient<IFunction, DataUriToBinaryFunction>();
         }
+
+        private static void AddLogicalComparisonFunctions(IServiceCollection services)
+        {
+            services.AddTransient<IFunction, AndFunction>();
+            services.AddTransient<IFunction, EqualFunction>();
+            services.AddTransient<IFunction, GreaterFunction>();
+            services.AddTransient<IFunction, GreaterOrEqualsFunction>();
+            services.AddTransient<IFunction, IfFunction>();
+            services.AddTransient<IFunction, LessFunction>();
+            services.AddTransient<IFunction, LessOrEqualsFunction>();
+            services.AddTransient<IFunction, NotFunction>();
+            services.AddTransient<IFunction, OrFunction>();
+        }
     }
 }
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