diff --git a/src/btf.c b/src/btf.c
index f77b6377bb42bdfcfec7a85ed7b96fea03f39f44..6e44f078ce9ba743e3e21afd5d740c7c1c39766a 100644
--- a/src/btf.c
+++ b/src/btf.c
@@ -3402,7 +3402,7 @@ struct btf_dedup {
 	struct strset *strs_set;
 };
 
-static long hash_combine(long h, long value)
+static unsigned long hash_combine(unsigned long h, unsigned long value)
 {
 	return h * 31 + value;
 }