1 files changed, 5 insertions, 0 deletions

diff --git a/src/utils/prefetch.h b/src/utils/prefetch.h
index a2c41ef..30e364e 100644
--- a/src/utils/prefetch.h
+++ b/src/utils/prefetch.h
@@ -1,3 +1,6 @@
+#ifndef UTILS_PREFETCH_H
+#define UTILS_PREFETCH_H
+
 #if defined(__GNUC__) || defined(__clang__)
     #define prefetch(a, i) __builtin_prefetch(a+i, 0, 0)
 #elif defined(AVX2)
@@ -5,3 +8,5 @@
 #else
     #define prefetch(a, i) (void)i
 #endif
+
+#endif /* UTILS_PREFETCH_H */