1 files changed, 1 insertions, 1 deletions
diff --git a/src/sexp.h b/src/sexp.h
index 2923088..d606acf 100644
--- a/src/sexp.h
+++ b/src/sexp.h
@@ -10,7 +10,7 @@ struct sexp;
 typedef struct sexp SExp;
 
 typedef struct {
-    int idx;
+    int32_t idx;
 } SExpRef;
 
 typedef struct {