diff --git a/src/arkode/arkode_lsrkstep_impl.h b/src/arkode/arkode_lsrkstep_impl.h
index 8abd1a366f..e7038c414b 100644
--- a/src/arkode/arkode_lsrkstep_impl.h
+++ b/src/arkode/arkode_lsrkstep_impl.h
@@ -39,11 +39,11 @@ extern "C" {
  *
  * SUNRcosh calls the appropriate version of cosh
  *
- * SUNIceil calls the appropriate version of ceil and returns sunindextype
+ * SUNIceil calls the appropriate version of ceil and returns int
  * 
- * SUNIfloor calls the appropriate version of floor and returns sunindextype
+ * SUNIfloor calls the appropriate version of floor and returns int
  * 
- * SUNIround calls the appropriate version of round and returns sunindextype
+ * SUNIround calls the appropriate version of round and returns int
  * -----------------------------------------------------------------
  */
 
@@ -123,20 +123,20 @@ extern "C" {
  * -----------------------------------------------------------------
  * Function : SUNIceil
  * -----------------------------------------------------------------
- * Usage : sunindextype ceil_x;
+ * Usage : int ceil_x;
  *         ceil_x = SUNIceil(x);
  * -----------------------------------------------------------------
- * SUNIceil(x) returns the smallest sunindextype value not less than x.
+ * SUNIceil(x) returns the smallest int value not less than x.
  * -----------------------------------------------------------------
  */
 
 #ifndef SUNIceil
 #if defined(SUNDIALS_DOUBLE_PRECISION)
-#define SUNIceil(x) ((sunindextype)(ceil((x)) + SUN_RCONST(0.5)))
+#define SUNIceil(x) ((int)(ceil((x)) + SUN_RCONST(0.5)))
 #elif defined(SUNDIALS_SINGLE_PRECISION)
-#define SUNIceil(x) ((sunindextype)(ceilf((x)) + SUN_RCONST(0.5)))
+#define SUNIceil(x) ((int)(ceilf((x)) + SUN_RCONST(0.5)))
 #elif defined(SUNDIALS_EXTENDED_PRECISION)
-#define SUNIceil(x) ((sunindextype)(ceill((x)) + SUN_RCONST(0.5)))
+#define SUNIceil(x) ((int)(ceill((x)) + SUN_RCONST(0.5)))
 #else
 #error \
   "SUNDIALS precision not defined, report to github.com/LLNL/sundials/issues"
@@ -147,20 +147,20 @@ extern "C" {
  * -----------------------------------------------------------------
  * Function : SUNIfloor
  * -----------------------------------------------------------------
- * Usage : sunindextype floor_x;
+ * Usage : int floor_x;
  *         floor_x = SUNIfloor(x);
  * -----------------------------------------------------------------
- * SUNIfloor(x) returns the largest sunindextype value not greater than x.
+ * SUNIfloor(x) returns the largest int value not greater than x.
  * -----------------------------------------------------------------
  */
 
 #ifndef SUNIfloor
 #if defined(SUNDIALS_DOUBLE_PRECISION)
-#define SUNIfloor(x) ((sunindextype)(floor((x)) + SUN_RCONST(0.5)))
+#define SUNIfloor(x) ((int)(floor((x)) + SUN_RCONST(0.5)))
 #elif defined(SUNDIALS_SINGLE_PRECISION)
-#define SUNIfloor(x) ((sunindextype)(floorf((x)) + SUN_RCONST(0.5)))
+#define SUNIfloor(x) ((int)(floorf((x)) + SUN_RCONST(0.5)))
 #elif defined(SUNDIALS_EXTENDED_PRECISION)
-#define SUNIfloor(x) ((sunindextype)(floorl((x)) + SUN_RCONST(0.5)))
+#define SUNIfloor(x) ((int)(floorl((x)) + SUN_RCONST(0.5)))
 #else
 #error \
   "SUNDIALS precision not defined, report to github.com/LLNL/sundials/issues"
@@ -171,21 +171,21 @@ extern "C" {
  * -----------------------------------------------------------------
  * Function : SUNIround
  * -----------------------------------------------------------------
- * Usage : sunindextype round_x;
+ * Usage : int round_x;
  *         round_x = SUNIround(x);
  * -----------------------------------------------------------------
- * SUNIround(x) returns the nearest sunindextype value to x, 
+ * SUNIround(x) returns the nearest int value to x, 
  * rounding halfway cases away from zero, regardless of the current rounding mode.
  * -----------------------------------------------------------------
  */
 
 #ifndef SUNIround
 #if defined(SUNDIALS_DOUBLE_PRECISION)
-#define SUNIround(x) ((sunindextype)(round((x)) + SUN_RCONST(0.5)))
+#define SUNIround(x) ((int)(round((x)) + SUN_RCONST(0.5)))
 #elif defined(SUNDIALS_SINGLE_PRECISION)
-#define SUNIround(x) ((sunindextype)(roundf((x)) + SUN_RCONST(0.5)))
+#define SUNIround(x) ((int)(roundf((x)) + SUN_RCONST(0.5)))
 #elif defined(SUNDIALS_EXTENDED_PRECISION)
-#define SUNIround(x) ((sunindextype)(roundl((x)) + SUN_RCONST(0.5)))
+#define SUNIround(x) ((int)(roundl((x)) + SUN_RCONST(0.5)))
 #else
 #error \
   "SUNDIALS precision not defined, report to github.com/LLNL/sundials/issues"