1 files changed, 2 insertions, 2 deletions

diff --git a/src/solvers/h48/solve.h b/src/solvers/h48/solve.h
index 4a1e961..c2dce91 100644
--- a/src/solvers/h48/solve.h
+++ b/src/solvers/h48/solve.h
@@ -4,7 +4,7 @@ typedef struct {
         int8_t nmoves;
         int8_t depth;
         uint8_t moves[MAXLEN];
-        int64_t *nsols;
+        _Atomic int64_t *nsols;
         int64_t maxsolutions;
         uint8_t h;
         uint8_t k;
@@ -167,7 +167,7 @@ solve_h48(
         char *solutions
 )
 {
-        int64_t nsols;
+        _Atomic int64_t nsols;
         dfsarg_solveh48_t arg;
         tableinfo_t info;