1 files changed, 2 insertions, 2 deletions
diff --git a/lib/dpo.c b/lib/dpo.c
index 5bf069b..5d481a7 100644
--- a/lib/dpo.c
+++ b/lib/dpo.c
@@ -21,7 +21,7 @@ ts_parameter_t const ts_dpo_p = { .n_inputs = 1, .n_outputs = 1, .n_constants =
 uint_t ts_dpo_offset( ts_constant_t const *c )
 {
 	( void )c;
-	return ( c ? ((ts_dpo_params_t *)c)->k / 2 + 1 : 0 );
+	return ( c ? ((ts_dpo_params_t const *)c)->k / 2 + 1 : 0 );
 }
 
 int ts_dpo(
@@ -32,7 +32,7 @@ int ts_dpo(
 {
 	TS_PROLOGUE( ts_dpo_p );
 	if ( !c ) return -1;
-    uint_t k = ((ts_dpo_params_t *)c)->k;
+    uint_t k = ((ts_dpo_params_t const *)c)->k;
     if (k == 0 || n < k) return -1;
 
     uint_t sma_period = k;