diff --git a/CHANGES_CURRENT.md b/CHANGES_CURRENT.md
index 602add5121..4475d1a75c 100644
--- a/CHANGES_CURRENT.md
+++ b/CHANGES_CURRENT.md
@@ -6,6 +6,7 @@
 - #3007 - Extensions: Show 'missing dependency' activation error to user
 - #3011 - Vim: Visual Block - Handle 'I' and 'A' in visual block mode (fixes #1633)
 - #3016 - Extensions: Fix memory leak in extension host language features (fixes #3009)
+- #3019 - Extensions: Fix activation error for Ionide.Ionide-fsharp extension (fixes #2974)
 
 ### Performance
 
diff --git a/src/Exthost/Extension/InitData.re b/src/Exthost/Extension/InitData.re
index bf9d4d73af..adec9af8f4 100644
--- a/src/Exthost/Extension/InitData.re
+++ b/src/Exthost/Extension/InitData.re
@@ -13,6 +13,20 @@ module Identifier = {
 };
 
 module Hacks = {
+  let patchIonideDependencies = (dependencies: list(Yojson.Safe.t)) => {
+    dependencies
+    |> List.map(
+         fun
+         | `String(str) =>
+           if (str == "ms-dotnettools.csharp") {
+             `String("muhammad-sammy.csharp");
+           } else {
+             `String(str);
+           }
+         | json => json,
+       );
+  };
+
   // TEMPORARY workarounds for external bugs blocking extensions
   let hacks = [
     // Workaround for https://github.com/open-vsx/publish-extensions/issues/106
@@ -25,6 +39,17 @@ module Hacks = {
         | _ => Some(`String("2020-08-04")),
       ),
     ),
+    (
+      // Workaround for https://github.com/onivim/oni2/issues/2974
+      "ionide.ionide-fsharp",
+      Utility.JsonEx.update(
+        "extensionDependencies",
+        fun
+        | Some(`List(dependencies)) =>
+          Some(`List(dependencies |> patchIonideDependencies))
+        | json => json,
+      ),
+    ),
   ];
 
   let apply = (~extensionId, initDataJson) => {