1 files changed, 5 insertions, 0 deletions

diff --git a/src/solvers/coord/cornersx.h b/src/solvers/coord/cornersx.h
index 788db8d..f4b564f 100644
--- a/src/solvers/coord/cornersx.h
+++ b/src/solvers/coord/cornersx.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_COORD_CORNERSX_H
+#define SOLVERS_COORD_CORNERSX_H
+
 STATIC bool is_cornersx_solved(uint64_t, const unsigned char *);
 
 STATIC coord_t coordinate_cornersx = {
@@ -74,3 +77,5 @@ is_cornersx_solved(uint64_t coord, const unsigned char *data)
 
         return false;
 }
+
+#endif /* SOLVERS_COORD_CORNERSX_H */