diff --git a/ethash.h b/ethash.h
index ea94fd762..b8ad2255a 100644
--- a/ethash.h
+++ b/ethash.h
@@ -88,7 +88,7 @@ void ethash_light_delete(ethash_light_t light);
  */
 ethash_return_value_t ethash_light_compute(
 	ethash_light_t light,
-	const ethash_h256_t header_hash,
+	ethash_h256_t const header_hash,
 	uint64_t  nonce
 );
 
diff --git a/internal.c b/internal.c
index 9e6d3a9eb..3d598a26c 100644
--- a/internal.c
+++ b/internal.c
@@ -332,7 +332,7 @@ bool ethash_light_compute_internal(
 	ethash_return_value_t* ret,
 	ethash_light_t light,
 	uint64_t full_size,
-	const ethash_h256_t header_hash,
+	ethash_h256_t const header_hash,
 	uint64_t nonce
 )
 {
@@ -349,7 +349,7 @@ bool ethash_light_compute_internal(
 
 ethash_return_value_t ethash_light_compute(
 	ethash_light_t light,
-	const ethash_h256_t header_hash,
+	ethash_h256_t const header_hash,
 	uint64_t const nonce
 )
 {
diff --git a/internal.h b/internal.h
index bb622177d..a73b5ad30 100644
--- a/internal.h
+++ b/internal.h
@@ -101,7 +101,7 @@ bool ethash_light_compute_internal(
 	ethash_return_value_t* ret,
 	ethash_light_t light,
 	uint64_t full_size,
-	const ethash_h256_t header_hash,
+	ethash_h256_t const header_hash,
 	uint64_t const nonce
 );