diff --git a/app/src/main/java/eu/faircode/email/MessageHelper.java b/app/src/main/java/eu/faircode/email/MessageHelper.java
index c9dad76f24..629f09235c 100644
--- a/app/src/main/java/eu/faircode/email/MessageHelper.java
+++ b/app/src/main/java/eu/faircode/email/MessageHelper.java
@@ -1884,21 +1884,22 @@ public class MessageHelper {
                 }
 
                 if (h.isPlainText()) {
-                    if (StandardCharsets.ISO_8859_1.equals(cs) && CharsetHelper.isUTF8(result)) {
-                        Log.i("Charset upgrade=UTF8");
-                        result = new String(result.getBytes(StandardCharsets.ISO_8859_1), StandardCharsets.UTF_8);
-                    } else if (charset == null) {
-                        Charset detected = CharsetHelper.detect(result);
-                        if (detected == null) {
-                            if (CharsetHelper.isUTF8(result)) {
-                                Log.i("Charset plain=UTF8");
-                                result = new String(result.getBytes(StandardCharsets.ISO_8859_1), StandardCharsets.UTF_8);
-                            }
+                    if (charset == null || StandardCharsets.ISO_8859_1.equals(cs))
+                        if (StandardCharsets.ISO_8859_1.equals(cs) && CharsetHelper.isUTF8(result)) {
+                            Log.i("Charset upgrade=UTF8");
+                            result = new String(result.getBytes(StandardCharsets.ISO_8859_1), StandardCharsets.UTF_8);
                         } else {
-                            Log.i("Charset plain=" + detected.name());
-                            result = new String(result.getBytes(StandardCharsets.ISO_8859_1), detected);
+                            Charset detected = CharsetHelper.detect(result);
+                            if (detected == null) {
+                                if (CharsetHelper.isUTF8(result)) {
+                                    Log.i("Charset plain=UTF8");
+                                    result = new String(result.getBytes(StandardCharsets.ISO_8859_1), StandardCharsets.UTF_8);
+                                }
+                            } else {
+                                Log.i("Charset plain=" + detected.name());
+                                result = new String(result.getBytes(StandardCharsets.ISO_8859_1), detected);
+                            }
                         }
-                    }
 
                     if ("flowed".equalsIgnoreCase(h.contentType.getParameter("format")))
                         result = HtmlHelper.flow(result);