diff --git a/app/src/main/java/eu/faircode/email/CharsetHelper.java b/app/src/main/java/eu/faircode/email/CharsetHelper.java
index e0d3fb6227..2823a569a3 100644
--- a/app/src/main/java/eu/faircode/email/CharsetHelper.java
+++ b/app/src/main/java/eu/faircode/email/CharsetHelper.java
@@ -43,7 +43,7 @@ class CharsetHelper {
         System.loadLibrary("fairemail");
     }
 
-    private static native DetectResult jni_detect(byte[] octets);
+    private static native DetectResult jni_detect_charset(byte[] octets);
 
     static boolean isUTF8(String text) {
         // Get extended ASCII characters
@@ -75,7 +75,7 @@ class CharsetHelper {
             }
 
             Log.i("compact_enc_det sample=" + sample.length);
-            DetectResult detected = jni_detect(sample);
+            DetectResult detected = jni_detect_charset(sample);
 
             if (TextUtils.isEmpty(detected.charset)) {
                 Log.e("compact_enc_det result=" + detected);
diff --git a/app/src/main/java/eu/faircode/email/TextHelper.java b/app/src/main/java/eu/faircode/email/TextHelper.java
index 7e9ed51d7e..9eae316fd5 100644
--- a/app/src/main/java/eu/faircode/email/TextHelper.java
+++ b/app/src/main/java/eu/faircode/email/TextHelper.java
@@ -45,7 +45,7 @@ public class TextHelper {
         System.loadLibrary("fairemail");
     }
 
-    private static native String jni_language(byte[] octets);
+    private static native String jni_detect_language(byte[] octets);
 
     static Locale detectLanguage(Context context, String text) {
         // Why not ML kit? https://developers.google.com/ml-kit/terms
@@ -54,7 +54,7 @@ public class TextHelper {
 
         if (BuildConfig.DEBUG) {
             // https://github.com/google/cld3
-            String lang = jni_language(text.getBytes());
+            String lang = jni_detect_language(text.getBytes());
             return Locale.forLanguageTag(lang);
         }
 
diff --git a/app/src/main/jni/fairemail.cc b/app/src/main/jni/fairemail.cc
index 89918230c4..0b3a38285d 100644
--- a/app/src/main/jni/fairemail.cc
+++ b/app/src/main/jni/fairemail.cc
@@ -21,7 +21,7 @@ void log_android(int prio, const char *fmt, ...) {
 }
 
 extern "C" JNIEXPORT jobject JNICALL
-Java_eu_faircode_email_CharsetHelper_jni_1detect(JNIEnv *env, jclass type, jbyteArray _octets) {
+Java_eu_faircode_email_CharsetHelper_jni_1detect_1charset(JNIEnv *env, jclass type, jbyteArray _octets) {
     int len = env->GetArrayLength(_octets);
     jbyte *octets = env->GetByteArrayElements(_octets, nullptr);
 
@@ -60,7 +60,7 @@ Java_eu_faircode_email_CharsetHelper_jni_1detect(JNIEnv *env, jclass type, jbyte
 
 extern "C"
 JNIEXPORT jstring JNICALL
-Java_eu_faircode_email_TextHelper_jni_1language(JNIEnv *env, jclass clazz, jbyteArray _octets) {
+Java_eu_faircode_email_TextHelper_jni_1detect_1language(JNIEnv *env, jclass clazz, jbyteArray _octets) {
     int len = env->GetArrayLength(_octets);
     jbyte *octets = env->GetByteArrayElements(_octets, nullptr);