diff --git a/bdk/mem/heap.c b/bdk/mem/heap.c
index 430cf22f..33c4c4bb 100644
--- a/bdk/mem/heap.c
+++ b/bdk/mem/heap.c
@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2018 naehrwert
- * Copyright (c) 2018-2025 CTCaer
+ * Copyright (c) 2018-2026 CTCaer
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
diff --git a/bdk/mem/smmu.h b/bdk/mem/smmu.h
index 243089be..9952457b 100644
--- a/bdk/mem/smmu.h
+++ b/bdk/mem/smmu.h
@@ -15,10 +15,13 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include <assert.h>
-
 #include <utils/types.h>
 
+#ifndef _SMMU_H_
+#define _SMMU_H_
+
+#include <assert.h>
+
 #define MC_SMMU_AVPC_ASID            0x23C
 #define MC_SMMU_TSEC_ASID            0x294
 
@@ -70,3 +73,5 @@ void  smmu_deinit_domain(u32 dev_base, u32 asid);
 void  smmu_domain_bypass(u32 dev_base, bool bypass);
 void  smmu_map(void *ptb, u32 iova, u64 iopa, u32 pages, u32 attr);
 void  smmu_map_huge(void *ptb, u32 iova, u64 iopa, u32 regions, u32 attr);
+
+#endif
diff --git a/bdk/soc/bpmp.h b/bdk/soc/bpmp.h
index cffec232..1864538e 100644
--- a/bdk/soc/bpmp.h
+++ b/bdk/soc/bpmp.h
@@ -51,7 +51,7 @@ typedef enum
 	BPMP_CLK_SUPER_BOOST, // 576MHz 41% - 144MHz APB.
 	BPMP_CLK_HYPER_BOOST, // 589MHz 44% - 147MHz APB.
 	//BPMP_CLK_DEV_BOOST, // 608MHz 49% - 152MHz APB.
-	BPMP_CLK_NUM 
+	BPMP_CLK_NUM
 } bpmp_freq_t;
 
 typedef enum
diff --git a/bdk/utils/dirlist.h b/bdk/utils/dirlist.h
index cf702469..daec60a5 100644
--- a/bdk/utils/dirlist.h
+++ b/bdk/utils/dirlist.h
@@ -16,6 +16,9 @@
 
 #include <utils/types.h>
 
+#ifndef _DIRLIST_H_
+#define _DIRLIST_H_
+
 #define DIR_MAX_ENTRIES 64
 
 #define DIR_SHOW_HIDDEN BIT(0)
@@ -29,3 +32,5 @@ typedef struct _dirlist_t
 } dirlist_t;
 
 dirlist_t *dirlist(const char *directory, const char *pattern, u32 flags);
+
+#endif