diff --git a/Lombiq.HelpfulLibraries.AspNetCore/Security/IContentSecurityPolicyProvider.cs b/Lombiq.HelpfulLibraries.AspNetCore/Security/IContentSecurityPolicyProvider.cs
index 503eba69..5832c2da 100644
--- a/Lombiq.HelpfulLibraries.AspNetCore/Security/IContentSecurityPolicyProvider.cs
+++ b/Lombiq.HelpfulLibraries.AspNetCore/Security/IContentSecurityPolicyProvider.cs
@@ -20,6 +20,13 @@ public interface IContentSecurityPolicyProvider
     /// </summary>
     public ValueTask UpdateAsync(IDictionary<string, string> securityPolicies, HttpContext context);
 
+    [Obsolete($"Use the method in the {nameof(ContentSecurityPolicyProvider)} static class instead.")]
+    public static string GetDirective(IDictionary<string, string> securityPolicies, params string[] names) =>
+        ContentSecurityPolicyProvider.GetDirective(securityPolicies, names.AsEnumerable());
+}
+
+public static class ContentSecurityPolicyProvider
+{
     /// <summary>
     /// Returns the first non-empty directive from the <paramref name="names"/> or <see cref="DefaultSrc"/> or an empty
     /// string.
diff --git a/Lombiq.HelpfulLibraries.OrchardCore/Security/ContentSecurityPolicyAttributeContentSecurityPolicyProvider.cs b/Lombiq.HelpfulLibraries.OrchardCore/Security/ContentSecurityPolicyAttributeContentSecurityPolicyProvider.cs
index ef6aa8b1..2239147d 100644
--- a/Lombiq.HelpfulLibraries.OrchardCore/Security/ContentSecurityPolicyAttributeContentSecurityPolicyProvider.cs
+++ b/Lombiq.HelpfulLibraries.OrchardCore/Security/ContentSecurityPolicyAttributeContentSecurityPolicyProvider.cs
@@ -65,7 +65,7 @@ public ValueTask UpdateAsync(IDictionary<string, string> securityPolicies, HttpC
         {
             foreach (var attribute in actionDescriptor.MethodInfo.GetCustomAttributes<ContentSecurityPolicyAttribute>())
             {
-                IContentSecurityPolicyProvider.MergeDirectiveValues(
+                ContentSecurityPolicyProvider.MergeDirectiveValues(
                     securityPolicies,
                     attribute.DirectiveNames,
                     attribute.DirectiveValue);
diff --git a/Lombiq.HelpfulLibraries.OrchardCore/Security/ResourceManagerContentSecurityPolicyProvider.cs b/Lombiq.HelpfulLibraries.OrchardCore/Security/ResourceManagerContentSecurityPolicyProvider.cs
index 698ddc39..3735b730 100644
--- a/Lombiq.HelpfulLibraries.OrchardCore/Security/ResourceManagerContentSecurityPolicyProvider.cs
+++ b/Lombiq.HelpfulLibraries.OrchardCore/Security/ResourceManagerContentSecurityPolicyProvider.cs
@@ -31,7 +31,7 @@ public ValueTask UpdateAsync(IDictionary<string, string> securityPolicies, HttpC
 
         if (resourceExists)
         {
-            IContentSecurityPolicyProvider.MergeDirectiveValues(securityPolicies, DirectiveNameChain, DirectiveValue);
+            ContentSecurityPolicyProvider.MergeDirectiveValues(securityPolicies, DirectiveNameChain, DirectiveValue);
         }
 
         return ThenUpdateAsync(securityPolicies, context, resourceExists);