diff --git a/prism/src/sparse/PS_NondetMultiObj.cc b/prism/src/sparse/PS_NondetMultiObj.cc
index f2a89602..d891c75e 100644
--- a/prism/src/sparse/PS_NondetMultiObj.cc
+++ b/prism/src/sparse/PS_NondetMultiObj.cc
@@ -172,8 +172,8 @@ JNIEXPORT jdoubleArray __jlongpointer JNICALL Java_sparse_PrismSparse_PS_1Nondet
 		
 		double* weights = env->GetDoubleArrayElements(_weights, 0);
 		
-		int* step_bounds_r = (has_rewards) ? env->GetIntArrayElements(_ndsm_r_step_bounds, 0) : NULL;
-		int* step_bounds = (has_yes_vec) ? env->GetIntArrayElements(_prob_step_bounds, 0) : NULL;
+		int* step_bounds_r = (has_rewards) ? (int*)env->GetIntArrayElements(_ndsm_r_step_bounds, 0) : NULL;
+		int* step_bounds = (has_yes_vec) ? (int*)env->GetIntArrayElements(_prob_step_bounds, 0) : NULL;
 
 		
 		int max_step_bound = 0;