diff --git a/crypto_kem/hqc-128/avx2/repetition.c b/crypto_kem/hqc-128/avx2/repetition.c
index e9540c81..1187ec70 100644
--- a/crypto_kem/hqc-128/avx2/repetition.c
+++ b/crypto_kem/hqc-128/avx2/repetition.c
@@ -10,7 +10,7 @@
  */
 
 
-#define MASK_N2                              ((1UL << PARAM_N2) - 1)
+#define MASK_N2 ((((uint64_t) 1) << PARAM_N2) - 1)
 
 /**
  * @brief Decoding the code words to a message using the repetition code
diff --git a/crypto_kem/hqc-128/clean/repetition.c b/crypto_kem/hqc-128/clean/repetition.c
index 654e34a1..ade90caf 100644
--- a/crypto_kem/hqc-128/clean/repetition.c
+++ b/crypto_kem/hqc-128/clean/repetition.c
@@ -8,7 +8,7 @@
  * @brief Implementation of repetition codes
  */
 
-#define MASK_N2                              ((1UL << PARAM_N2) - 1)
+#define MASK_N2 ((((uint64_t) 1) << PARAM_N2) - 1)
 
 static inline int32_t popcount(uint64_t n);
 
diff --git a/crypto_kem/hqc-192/avx2/repetition.c b/crypto_kem/hqc-192/avx2/repetition.c
index 8c873b6f..a4851e59 100644
--- a/crypto_kem/hqc-192/avx2/repetition.c
+++ b/crypto_kem/hqc-192/avx2/repetition.c
@@ -10,7 +10,7 @@
  */
 
 
-#define MASK_N2                              ((1UL << PARAM_N2) - 1)
+#define MASK_N2 ((((uint64_t) 1) << PARAM_N2) - 1)
 
 /**
  * @brief Decoding the code words to a message using the repetition code
diff --git a/crypto_kem/hqc-192/clean/repetition.c b/crypto_kem/hqc-192/clean/repetition.c
index c11de2aa..09f647ff 100644
--- a/crypto_kem/hqc-192/clean/repetition.c
+++ b/crypto_kem/hqc-192/clean/repetition.c
@@ -8,7 +8,7 @@
  * @brief Implementation of repetition codes
  */
 
-#define MASK_N2                              ((1UL << PARAM_N2) - 1)
+#define MASK_N2 ((((uint64_t) 1) << PARAM_N2) - 1)
 
 static inline int32_t popcount(uint64_t n);