diff --git a/src/fesa/elements/hex8_pair_arithmetic.h b/src/fesa/elements/hex8_pair_arithmetic.h
index 2b8fb58..d2fdd5f 100644
--- a/src/fesa/elements/hex8_pair_arithmetic.h
+++ b/src/fesa/elements/hex8_pair_arithmetic.h
@@ -1,5 +1,5 @@
-#ifndef FESA_ELEMENTS_HEX8_PAIR_ARITHMETIC_H_
-#define FESA_ELEMENTS_HEX8_PAIR_ARITHMETIC_H_
+#ifndef FESA_SRC_FESA_ELEMENTS_HEX8_PAIR_ARITHMETIC_H_
+#define FESA_SRC_FESA_ELEMENTS_HEX8_PAIR_ARITHMETIC_H_
 
 #include "../math/high_low_arithmetic.h"
 
@@ -37,4 +37,4 @@ inline math_internal::HighLow MultiplyPair(math_internal::HighLow left,
 }
 }  // namespace fesa::hex8_internal
 
-#endif  // FESA_ELEMENTS_HEX8_PAIR_ARITHMETIC_H_
+#endif  // FESA_SRC_FESA_ELEMENTS_HEX8_PAIR_ARITHMETIC_H_