diff --git a/src/common/util/hasher.cpp b/src/common/util/hasher.cpp
index 7829d1559..5e4bb9633 100644
--- a/src/common/util/hasher.cpp
+++ b/src/common/util/hasher.cpp
@@ -27,7 +27,7 @@ void InitHasher()
     }
 }
 
-uint64_t ComputeHash(void* data, size_t len)
+uint64_t ComputeHash(const void* data, size_t len)
 {
     if (g_HashAlgorithm == HASH_NONE) {
         InitHasher();
diff --git a/src/common/util/hasher.h b/src/common/util/hasher.h
index 5dc817742..a19a539ca 100644
--- a/src/common/util/hasher.h
+++ b/src/common/util/hasher.h
@@ -29,6 +29,6 @@
 
 #include <stdint.h>
 
-uint64_t ComputeHash(void* data, size_t len);
+uint64_t ComputeHash(const void* data, size_t len);
 
 #endif