diff --git a/drivers/arm/tzc/tzc400.c b/drivers/arm/tzc/tzc400.c
index ca088c32d00965cdb79b6ea8b5e53b6c49f4f7cf..8c6f8ba6b694873ce872705a807ff515662f0c80 100644
--- a/drivers/arm/tzc/tzc400.c
+++ b/drivers/arm/tzc/tzc400.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2016-2017, ARM Limited and Contributors. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
@@ -33,7 +33,7 @@
 #include <mmio.h>
 #include <stddef.h>
 #include <tzc400.h>
-#include "tzc_common_private.c"
+#include "tzc_common_private.h"
 
 /*
  * Macros which will be used by common core functions.
diff --git a/drivers/arm/tzc/tzc_common_private.c b/drivers/arm/tzc/tzc_common_private.h
similarity index 96%
rename from drivers/arm/tzc/tzc_common_private.c
rename to drivers/arm/tzc/tzc_common_private.h
index 8b1ddf498fff2ffc897d8dcdd50721a7d680a017..df10a1ee9c049418b988901c2f3eb7e77ac37242 100644
--- a/drivers/arm/tzc/tzc_common_private.c
+++ b/drivers/arm/tzc/tzc_common_private.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2016-2017, ARM Limited and Contributors. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
@@ -28,6 +28,9 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
+#ifndef __TZC_COMMON_PRIVATE_H__
+#define __TZC_COMMON_PRIVATE_H__
+
 #include <arch.h>
 #include <arch_helpers.h>
 #include <mmio.h>
@@ -191,7 +194,7 @@
 	}
 
 #if DEBUG
-static unsigned int _tzc_read_peripheral_id(uintptr_t base)
+static inline unsigned int _tzc_read_peripheral_id(uintptr_t base)
 {
 	unsigned int id;
 
@@ -203,7 +206,7 @@ static unsigned int _tzc_read_peripheral_id(uintptr_t base)
 }
 
 #ifdef AARCH32
-static unsigned long long _tzc_get_max_top_addr(int addr_width)
+static inline unsigned long long _tzc_get_max_top_addr(int addr_width)
 {
 	/*
 	 * Assume at least 32 bit wide address and initialize the max.
@@ -233,3 +236,5 @@ static unsigned long long _tzc_get_max_top_addr(int addr_width)
 #endif /* AARCH32 */
 
 #endif
+
+#endif /* __TZC_COMMON_PRIVATE_H__ */
diff --git a/drivers/arm/tzc/tzc_dmc500.c b/drivers/arm/tzc/tzc_dmc500.c
index 24e587c1624e4fa4e086aff09942a6982128239c..93ae92028a42803023ecfd48c29d432e3dff7bd4 100644
--- a/drivers/arm/tzc/tzc_dmc500.c
+++ b/drivers/arm/tzc/tzc_dmc500.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2016-2017, ARM Limited and Contributors. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
@@ -33,7 +33,7 @@
 #include <mmio.h>
 #include <tzc_dmc500.h>
 #include "tzc_common.h"
-#include "tzc_common_private.c"
+#include "tzc_common_private.h"
 
 /*
  * Macros which will be used by common core functions.