diff --git a/android/src/main/java/com/RNFetchBlob/RNFetchBlobReq.java b/android/src/main/java/com/RNFetchBlob/RNFetchBlobReq.java
index 5fde54097..d6dbccda1 100644
--- a/android/src/main/java/com/RNFetchBlob/RNFetchBlobReq.java
+++ b/android/src/main/java/com/RNFetchBlob/RNFetchBlobReq.java
@@ -300,8 +300,8 @@ else if (value.equalsIgnoreCase("utf8"))
                             responseFormat = ResponseFormat.UTF8;
                     }
                     else {
-                        builder.header(key.toLowerCase(), value);
-                        mheaders.put(key.toLowerCase(), value);
+                        builder.header(key.toLowerCase().replace("ı","i"), value);
+                        mheaders.put(key.toLowerCase().replace("ı","i"), value);
                     }
                 }
             }