1 files changed, 2 insertions, 2 deletions
diff --git a/checksum.h b/checksum.h
index 377e38d..5418406 100644
--- a/checksum.h
+++ b/checksum.h
@@ -6,9 +6,9 @@
 #ifndef CHECKSUM_H
 #define CHECKSUM_H
 
-uint32_t sum_16b(void *buf, size_t len);
+uint32_t sum_16b(const void *buf, size_t len);
 uint16_t csum_fold(uint32_t sum);
-uint16_t csum_unaligned(void *buf, size_t len, uint32_t init);
+uint16_t csum_unaligned(const void *buf, size_t len, uint32_t init);
 void csum_tcp4(struct iphdr *iph);
 uint16_t csum(const void *buf, size_t len, uint32_t init);