diff --git a/src/FirebaseHttpClient.h b/src/FirebaseHttpClient.h
index 4b585aa6..386a272c 100644
--- a/src/FirebaseHttpClient.h
+++ b/src/FirebaseHttpClient.h
@@ -40,6 +40,6 @@ class FirebaseHttpClient {
 };
 
 static const char kFirebaseFingerprint[] =
-      "B6 F5 80 C8 B1 DA 61 C1 07 9D 80 42 D8 A9 1F AF 9F C8 96 7D"; // 2019-04
+      "B6:F5:80:C8:B1:DA:61:C1:07:9D:80:42:D8:A9:1F:AF:9F:C8:96:7D"; // 2019-04
 
 #endif  // FIREBASE_HTTP_CLIENT_H