diff --git a/libraries/Portenta_SDRAM/src/SDRAM.h b/libraries/Portenta_SDRAM/src/SDRAM.h
index d5e8ef36b..0d8808f2d 100644
--- a/libraries/Portenta_SDRAM/src/SDRAM.h
+++ b/libraries/Portenta_SDRAM/src/SDRAM.h
@@ -1,3 +1,6 @@
+#ifndef __SDRAM_H
+#define __SDRAM_H
+
#include "ea_malloc.h"
#ifdef __cplusplus
@@ -35,4 +38,5 @@ class SDRAMClass {
extern SDRAMClass SDRAM;
-#endif
\ No newline at end of file
+#endif
+#endif // __SDRAM_H
diff --git a/libraries/Portenta_SDRAM/src/ram_internal.h b/libraries/Portenta_SDRAM/src/ram_internal.h
index 497ffb020..1d6ff0721 100644
--- a/libraries/Portenta_SDRAM/src/ram_internal.h
+++ b/libraries/Portenta_SDRAM/src/ram_internal.h
@@ -1,3 +1,6 @@
+#ifndef __RAM_INTERNAL_H
+#define __RAM_INTERNAL_H
+
bool sdram_init(void);
#define MPU_REGION_SDRAM1 (MPU_REGION_NUMBER4)
@@ -56,3 +59,5 @@ bool sdram_init(void);
| (size) << MPU_RASR_SIZE_Pos \
| MPU_REGION_ENABLE << MPU_RASR_ENABLE_Pos \
)
+
+#endif // __RAM_INTERNAL_H
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