diff --git a/xxhash.c b/xxhash.c
index 02e47b04..35f53155 100644
--- a/xxhash.c
+++ b/xxhash.c
@@ -988,12 +988,14 @@ XXH_PUBLIC_API unsigned long long XXH64_digest (const XXH64_state_t* state_in)
 
 XXH_PUBLIC_API void XXH32_canonicalFromHash(XXH32_canonical_t* dst, XXH32_hash_t hash)
 {
+    XXH_STATIC_ASSERT(sizeof(XXH32_canonical_t) == sizeof(XXH32_hash_t));
     if (XXH_CPU_LITTLE_ENDIAN) hash = XXH_swap32(hash);
     memcpy(dst, &hash, sizeof(*dst));
 }
 
 XXH_PUBLIC_API void XXH64_canonicalFromHash(XXH64_canonical_t* dst, XXH64_hash_t hash)
 {
+    XXH_STATIC_ASSERT(sizeof(XXH64_canonical_t) == sizeof(XXH64_hash_t));
     if (XXH_CPU_LITTLE_ENDIAN) hash = XXH_swap64(hash);
     memcpy(dst, &hash, sizeof(*dst));
 }