1 files changed, 5 insertions, 0 deletions

diff --git a/src/solvers/coord/common.h b/src/solvers/coord/common.h
index 3a62e85..8e6db20 100644
--- a/src/solvers/coord/common.h
+++ b/src/solvers/coord/common.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_COORD_COMMON_H
+#define SOLVERS_COORD_COMMON_H
+
 STATIC uint64_t coord_coord_generic(
     const coord_t [NON_NULL], cube_t, const unsigned char *);
 STATIC cube_t coord_cube_generic(
@@ -229,3 +232,5 @@ coordinate_merge_cpco(cube_t cp, cube_t co)
 
         return merged;
 }
+
+#endif /* SOLVERS_COORD_COMMON_H */