diff --git a/android/capacitor/src/main/java/com/getcapacitor/plugin/util/CapacitorHttpUrlConnection.java b/android/capacitor/src/main/java/com/getcapacitor/plugin/util/CapacitorHttpUrlConnection.java
index 06f52c334..cc784de79 100644
--- a/android/capacitor/src/main/java/com/getcapacitor/plugin/util/CapacitorHttpUrlConnection.java
+++ b/android/capacitor/src/main/java/com/getcapacitor/plugin/util/CapacitorHttpUrlConnection.java
@@ -289,6 +289,8 @@ private void writeFormDataRequestBody(String contentType, JSArray entries) throw
 
                         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                             os.write(Base64.getDecoder().decode(value));
+                        } else {
+                            os.write(android.util.Base64.decode(value, android.util.Base64.DEFAULT));
                         }
 
                         os.writeBytes(lineEnd);