diff --git a/tests/suites/test_suite_ecp.data b/tests/suites/test_suite_ecp.data
index c8ed20f..2f5f4ef 100644
--- a/tests/suites/test_suite_ecp.data
+++ b/tests/suites/test_suite_ecp.data
@@ -273,6 +273,22 @@
 depends_on:POLARSSL_ECP_DP_SECP192R1_ENABLED
 ecp_fast_mod:POLARSSL_ECP_DP_SECP192R1:"1AC2D6F96A2A425E9DD1776DD8368D4BBC86BF4964E79FEA713583BF948BBEFF0939F96FB19EC48C585BDA6A2D35C750"
 
+ECP mod p224 readable without carry
+depends_on:POLARSSL_ECP_DP_SECP224R1_ENABLED
+ecp_fast_mod:POLARSSL_ECP_DP_SECP224R1:"0000000D0000000C0000000B0000000A0000000900000008000000070000FF060000FF050000FF040000FF03000FF0020000FF010000FF00"
+
+ECP mod p224 readable with negative carry
+depends_on:POLARSSL_ECP_DP_SECP224R1_ENABLED
+ecp_fast_mod:POLARSSL_ECP_DP_SECP224R1:"0000000D0000000C0000000B0000000A00000009000000080000000700000006000000050000000400000003000000020000000100000000"
+
+ECP mod p224 readable with positive carry
+depends_on:POLARSSL_ECP_DP_SECP224R1_ENABLED
+ecp_fast_mod:POLARSSL_ECP_DP_SECP224R1:"0000000D0000000C0000000BFFFFFF0AFFFFFF09FFFFFF08FFFFFF070000FF060000FF050000FF040000FF03000FF0020000FF010000FF00"
+
+ECP mod p224 readable with final negative carry
+depends_on:POLARSSL_ECP_DP_SECP224R1_ENABLED
+ecp_fast_mod:POLARSSL_ECP_DP_SECP224R1:"FF00000D0000000C0000000B0000000A00000009000000080000000700000006000000050000000400000003000000020000000100000000"
+
 ECP mod p521 very small
 depends_on:POLARSSL_ECP_DP_SECP521R1_ENABLED
 ecp_fast_mod:POLARSSL_ECP_DP_SECP521R1:"01"
diff --git a/tests/suites/test_suite_ecp.function b/tests/suites/test_suite_ecp.function
index 6981f47..4eb5259 100644
--- a/tests/suites/test_suite_ecp.function
+++ b/tests/suites/test_suite_ecp.function
@@ -229,8 +229,9 @@
     mpi_init( &N ); mpi_init( &R );
     ecp_group_init( &grp );
 
-    TEST_ASSERT( ecp_use_known_dp( &grp, id ) == 0 );
     TEST_ASSERT( mpi_read_string( &N, 16, N_str ) == 0 );
+    TEST_ASSERT( ecp_use_known_dp( &grp, id ) == 0 );
+    TEST_ASSERT( grp.modp != NULL );
 
     /*
      * Store correct result before we touch N