1 files changed, 4 insertions, 1 deletions
diff --git a/cp_regs.h b/cp_regs.h
index 2bc6c9f..e5e7063 100644
--- a/cp_regs.h
+++ b/cp_regs.h
@@ -1,5 +1,7 @@
-#include <stdint.h>
+#ifndef CP_REGS_H
+#define CP_REGS_H
 
+#include <stdint.h>
 
 // SCTLR - System Control Register
 
@@ -109,3 +111,4 @@ typedef union
   } fields;
 } TTBR_t;
 
+#endif // CP_REGS_H