diff --git a/src/components/settings_modal/tabs/appearance_tab.js b/src/components/settings_modal/tabs/appearance_tab.js
index c2b6fa24f..fe2001af5 100644
--- a/src/components/settings_modal/tabs/appearance_tab.js
+++ b/src/components/settings_modal/tabs/appearance_tab.js
@@ -43,7 +43,7 @@ const AppearanceTab = {
       bundledPalettes: [],
       compilationCache: {},
       fileImporter: newImporter({
-        accept: '.json, .piss',
+        accept: '.json, .iss',
         validator: this.importValidator,
         onImport: this.onImport,
         parser: this.importParser,
@@ -305,14 +305,14 @@ const AppearanceTab = {
     importParser (file, filename) {
       if (filename.endsWith('.json')) {
         return JSON.parse(file)
-      } else if (filename.endsWith('.piss')) {
+      } else if (filename.endsWith('.iss')) {
         return deserialize(file)
       }
     },
     onImport (parsed, filename) {
       if (filename.endsWith('.json')) {
         this.$store.dispatch('setThemeCustom', parsed.source || parsed.theme)
-      } else if (filename.endsWith('.piss')) {
+      } else if (filename.endsWith('.iss')) {
         this.$store.dispatch('setStyleCustom', parsed)
       }
     },
@@ -324,7 +324,7 @@ const AppearanceTab = {
       if (filename.endsWith('.json')) {
         const version = parsed._pleroma_theme_version
         return version >= 1 || version <= 2
-      } else if (filename.endsWith('.piss')) {
+      } else if (filename.endsWith('.iss')) {
         if (!Array.isArray(parsed)) return false
         if (parsed.length < 1) return false
         if (parsed.find(x => x.component === '@meta') == null) return false
diff --git a/src/components/settings_modal/tabs/style_tab/style_tab.js b/src/components/settings_modal/tabs/style_tab/style_tab.js
index d38915c09..b51ce5307 100644
--- a/src/components/settings_modal/tabs/style_tab/style_tab.js
+++ b/src/components/settings_modal/tabs/style_tab/style_tab.js
@@ -604,7 +604,7 @@ export default {
     const styleExporter = newExporter({
       filename: () => exports.name.value ?? 'pleroma_theme',
       mime: 'text/plain',
-      extension: 'piss',
+      extension: 'iss',
       getExportedObject: () => exportStyleData.value
     })
 
@@ -636,7 +636,7 @@ export default {
     }
 
     const styleImporter = newImporter({
-      accept: '.piss',
+      accept: '.iss',
       parser (string) { return deserialize(string) },
       onImportFailure (result) {
         console.error('Failure importing style:', result)
diff --git a/static/styles/Breezy DX.piss b/static/styles/Breezy DX.iss
similarity index 100%
rename from static/styles/Breezy DX.piss
rename to static/styles/Breezy DX.iss
diff --git a/static/styles/Redmond DX.piss b/static/styles/Redmond DX.iss
similarity index 100%
rename from static/styles/Redmond DX.piss
rename to static/styles/Redmond DX.iss
diff --git a/static/styles/index.json b/static/styles/index.json
index 52365cd3c..6c1dd1676 100644
--- a/static/styles/index.json
+++ b/static/styles/index.json
@@ -1,4 +1,4 @@
 {
-  "RedmondDX": "/static/styles/Redmond DX.piss",
-  "BreezyDX": "/static/styles/Breezy DX.piss"
+  "RedmondDX": "/static/styles/Redmond DX.iss",
+  "BreezyDX": "/static/styles/Breezy DX.iss"
 }