diff --git a/libraries/AP_HAL_PX4/AP_HAL_PX4_Namespace.h b/libraries/AP_HAL_PX4/AP_HAL_PX4_Namespace.h
index 8871ec6906..09bb70b5e4 100644
--- a/libraries/AP_HAL_PX4/AP_HAL_PX4_Namespace.h
+++ b/libraries/AP_HAL_PX4/AP_HAL_PX4_Namespace.h
@@ -1,19 +1,18 @@
 #pragma once
 
 namespace PX4 {
-	class PX4Scheduler;
-	class PX4UARTDriver;
-	class PX4Storage;
-	class PX4RCInput;
-	class PX4RCOutput;
-	class PX4AnalogIn;
-	class PX4AnalogSource;
-	class PX4Util;
-        class PX4GPIO;
-        class PX4DigitalSource;
-        class NSHShellStream;
-        class PX4I2CDriver;
-        class PX4_I2C;
-        class PX4_SPI;
-        class Semaphore;
+    class PX4Scheduler;
+    class PX4UARTDriver;
+    class PX4Storage;
+    class PX4RCInput;
+    class PX4RCOutput;
+    class PX4AnalogIn;
+    class PX4AnalogSource;
+    class PX4Util;
+    class PX4GPIO;
+    class PX4DigitalSource;
+    class NSHShellStream;
+    class PX4I2CDriver;
+    class PX4_I2C;
+    class Semaphore;
 }