diff --git a/app/src/main/kotlin/com/simplemobiletools/smsmessenger/extensions/String.kt b/app/src/main/kotlin/com/simplemobiletools/smsmessenger/extensions/String.kt
index 4b0ebc34..8ad4bd49 100644
--- a/app/src/main/kotlin/com/simplemobiletools/smsmessenger/extensions/String.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/smsmessenger/extensions/String.kt
@@ -45,5 +45,5 @@ fun String.isZipMimeType(): Boolean {
 }
 
 fun String.isPlainTextMimeType(): Boolean {
-    return lowercase().startsWith("text")
+    return lowercase() == "text/plain"
 }