diff --git a/crypto/blake2/blake2_impl.h b/crypto/blake2/blake2_impl.h
index 694f9bb434dee0a2e7fadf6c8a554fb98e87f182..c613abd308b0bf48a7b0c2f13732991cb94e32f0 100644
--- a/crypto/blake2/blake2_impl.h
+++ b/crypto/blake2/blake2_impl.h
@@ -125,12 +125,12 @@ static ossl_inline void store48(uint8_t *dst, uint64_t w)
     *p++ = (uint8_t)w;
 }
 
-static ossl_inline uint32_t rotr32(const uint32_t w, const unsigned c)
+static ossl_inline uint32_t rotr32(const uint32_t w, const unsigned int c)
 {
     return (w >> c) | (w << (32 - c));
 }
 
-static ossl_inline uint64_t rotr64(const uint64_t w, const unsigned c)
+static ossl_inline uint64_t rotr64(const uint64_t w, const unsigned int c)
 {
     return (w >> c) | (w << (64 - c));
 }