diff --git a/i2c_smbus/i2c_smbus.h b/i2c_smbus/i2c_smbus.h
index 50750c1b..6f87eb61 100644
--- a/i2c_smbus/i2c_smbus.h
+++ b/i2c_smbus/i2c_smbus.h
@@ -41,7 +41,7 @@ union i2c_smbus_data
 
 #endif  /* __linux__ */
 
-#if defined(__APPLE___) || defined(__FreeBSD__)
+#if defined(__APPLE__) || defined(__FreeBSD__)
 
 //Data for SMBus Messages
 #define I2C_SMBUS_BLOCK_MAX     32