diff --git a/src/apps/posterize/pages/PosterizePage.tsx b/src/apps/posterize/pages/PosterizePage.tsx
index 24f04de..6829568 100644
--- a/src/apps/posterize/pages/PosterizePage.tsx
+++ b/src/apps/posterize/pages/PosterizePage.tsx
@@ -51,7 +51,7 @@ const PosterizePage = () => {
         body: JSON.stringify({
           b64_png: selectedImage,
           gray: gray,
-          ...(gray ? {} : { sigma: sigma })
+          sigma: sigma
         }),
       })
 
diff --git a/src/apps/tracy/pages/TracyPage.tsx b/src/apps/tracy/pages/TracyPage.tsx
index bcfcbb1..acdb399 100644
--- a/src/apps/tracy/pages/TracyPage.tsx
+++ b/src/apps/tracy/pages/TracyPage.tsx
@@ -140,7 +140,8 @@ const TracyPage = () => {
         },
         body: JSON.stringify({
           b64_png: imageData.base64_png,
-          gray: true
+          gray: true,
+          sigma: null
         }),
       })