diff --git a/lib/hawk.h b/lib/hawk.h
index f9a15eb3..9e454f39 100644
--- a/lib/hawk.h
+++ b/lib/hawk.h
@@ -3148,23 +3148,23 @@ HAWK_EXPORT hawk_val_t* hawk_rtx_makefunval (
  * \return HAWK_TRUE if \a val is static, HAWK_FALSE if \a val is false
  */
 HAWK_EXPORT int hawk_rtx_isstaticval (
-	hawk_rtx_t* rtx, /**< runtime context */
-	hawk_val_t* val  /**< value to check */
+	hawk_rtx_t*       rtx, /**< runtime context */
+	const hawk_val_t* val  /**< value to check */
 );
 
 HAWK_EXPORT int hawk_rtx_getvaltype (
-	hawk_rtx_t* rtx,
-	hawk_val_t* val
+	hawk_rtx_t*      rtx,
+	const hawk_val_t* val
 );
 
 HAWK_EXPORT const hawk_ooch_t* hawk_rtx_getvaltypename (
-	hawk_rtx_t* rtx,
-	hawk_val_t* val
+	hawk_rtx_t*       rtx,
+	const hawk_val_t* val
 );
 
 HAWK_EXPORT int hawk_rtx_getintfromval (
-	hawk_rtx_t* rtx,
-	hawk_val_t* val
+	hawk_rtx_t*       rtx,
+	const hawk_val_t* val
 );
 
 /**
diff --git a/lib/val.c b/lib/val.c
index b54d93f7..e14f8376 100644
--- a/lib/val.c
+++ b/lib/val.c
@@ -1419,17 +1419,17 @@ hawk_val_t* hawk_rtx_makefunval (hawk_rtx_t* rtx, const hawk_fun_t* fun)
 	return (hawk_val_t*)val;
 }
 
-int HAWK_INLINE hawk_rtx_isstaticval (hawk_rtx_t* rtx, hawk_val_t* val)
+int HAWK_INLINE hawk_rtx_isstaticval (hawk_rtx_t* rtx, const hawk_val_t* val)
 {
 	return HAWK_VTR_IS_POINTER(val) && HAWK_IS_STATICVAL(val);
 }
 
-int hawk_rtx_getvaltype (hawk_rtx_t* rtx, hawk_val_t* val)
+int hawk_rtx_getvaltype (hawk_rtx_t* rtx, const hawk_val_t* val)
 {
 	return HAWK_RTX_GETVALTYPE(rtx, val);
 }
 
-const hawk_ooch_t* hawk_rtx_getvaltypename(hawk_rtx_t* rtx, hawk_val_t* val)
+const hawk_ooch_t* hawk_rtx_getvaltypename(hawk_rtx_t* rtx, const hawk_val_t* val)
 {
 	static const hawk_ooch_t* __val_type_name[] =
 	{
@@ -1452,7 +1452,7 @@ const hawk_ooch_t* hawk_rtx_getvaltypename(hawk_rtx_t* rtx, hawk_val_t* val)
 	return __val_type_name[HAWK_RTX_GETVALTYPE(rtx, val)];
 }
 
-int hawk_rtx_getintfromval (hawk_rtx_t* rtx, hawk_val_t* val)
+int hawk_rtx_getintfromval (hawk_rtx_t* rtx, const hawk_val_t* val)
 {
 	return HAWK_RTX_GETINTFROMVAL(rtx, val);
 }