diff --git a/pages/api/allWakaValues.js b/pages/api/allWakaValues.js
index 1b4dcc69..677d61a7 100644
--- a/pages/api/allWakaValues.js
+++ b/pages/api/allWakaValues.js
@@ -20,7 +20,7 @@ async function handle(req, res) {
     itemValuesByIdOrName = await loadWakaValuesByIdOrName();
   } catch (e) {
     console.error(e);
-    res.setHeader("Content-Type", "text/plain");
+    res.setHeader("Content-Type", "text/plain; charset=utf8");
     res.status(500).send("Error loading Waka data from Google Sheets API");
     return;
   }
diff --git a/pages/api/assetImage.js b/pages/api/assetImage.js
index ab05e942..1a13c085 100644
--- a/pages/api/assetImage.js
+++ b/pages/api/assetImage.js
@@ -173,7 +173,7 @@ function isNeopetsUrl(urlString) {
 }
 
 function reject(res, message, status = 400) {
-  res.setHeader("Content-Type", "text/plain");
+  res.setHeader("Content-Type", "text/plain; charset=utf8");
   return res.status(status).send(message);
 }
 
diff --git a/pages/api/outfitImage.js b/pages/api/outfitImage.js
index 4904757a..5e67f005 100644
--- a/pages/api/outfitImage.js
+++ b/pages/api/outfitImage.js
@@ -225,7 +225,7 @@ async function loadUpdatedAtForSavedOutfit(outfitId) {
 }
 
 function reject(res, message, status = 400) {
-  res.setHeader("Content-Type", "text/plain");
+  res.setHeader("Content-Type", "text/plain; charset=utf8");
   return res.status(status).send(message);
 }
 
diff --git a/pages/api/outfitPageSSR.js b/pages/api/outfitPageSSR.js
index d34bd744..712c2f73 100644
--- a/pages/api/outfitPageSSR.js
+++ b/pages/api/outfitPageSSR.js
@@ -132,7 +132,7 @@ async function loadIndexPageHtml() {
 }
 
 function reject(res, message, status = 400) {
-  res.setHeader("Content-Type", "text/plain");
+  res.setHeader("Content-Type", "text/plain; charset=utf8");
   return res.status(status).send(message);
 }