diff --git a/tests/suites/test_suite_mpi.function b/tests/suites/test_suite_mpi.function
index 0c5781c..b0ebee4 100644
--- a/tests/suites/test_suite_mpi.function
+++ b/tests/suites/test_suite_mpi.function
@@ -1,6 +1,10 @@
 /* BEGIN_HEADER */
 #include "mbedtls/bignum.h"
 
+#if MBEDTLS_MPI_MAX_BITS > 256
+#define MPI_MAX_BITS_LARGER_THAN_256
+#endif
+
 typedef struct mbedtls_test_mpi_random
 {
     uint8_t     *data;
@@ -868,7 +872,7 @@
 }
 /* END_CASE */
 
-/* BEGIN_CASE */
+/* BEGIN_CASE depends_on:MPI_MAX_BITS_LARGER_THAN_256 */
 void mbedtls_mpi_exp_mod( int radix_A, char *input_A, int radix_E, char *input_E,
                   int radix_N, char *input_N, int radix_RR, char *input_RR,
                   int radix_X, char *input_X, int div_result )