diff --git a/src/ConfigurableFirmata.cpp b/src/ConfigurableFirmata.cpp
index 6f46656..a7b2e6d 100644
--- a/src/ConfigurableFirmata.cpp
+++ b/src/ConfigurableFirmata.cpp
@@ -34,8 +34,8 @@ extern "C" {
  */
 void FirmataClass::sendValueAsTwo7bitBytes(int value)
 {
-  FirmataStream->write(value & B01111111); // LSB
-  FirmataStream->write(value >> 7 & B01111111); // MSB
+  FirmataStream->write(value & 0B01111111); // LSB
+  FirmataStream->write(value >> 7 & 0B01111111); // MSB
 }
 
 /**