1 files changed, 5 insertions, 0 deletions

diff --git a/src/solvers/coord/dr.h b/src/solvers/coord/dr.h
index 8100910..c5c73c2 100644
--- a/src/solvers/coord/dr.h
+++ b/src/solvers/coord/dr.h
@@ -1,3 +1,6 @@
+#ifndef SOLVERS_COORD_DR_H
+#define SOLVERS_COORD_DR_H
+
 #define DREOESEP_CLASSES UINT64_C(64430)
 #define DREOESEP_MAX     (POW_2_11 * COMB_12_4)
 
@@ -117,3 +120,5 @@ is_eoco_solvable(cube_t cube) {
 
         return cocount % 3 == 0 && eocount % 2 == 0;
 }
+
+#endif /* SOLVERS_COORD_DR_H */