diff --git a/tests/suites/test_suite_pk.function b/tests/suites/test_suite_pk.function
index 237a809..5709ed2 100644
--- a/tests/suites/test_suite_pk.function
+++ b/tests/suites/test_suite_pk.function
@@ -723,6 +723,8 @@
     size_t olen, rlen;
 
     mbedtls_pk_init( &pk );
+    mbedtls_mpi_init( &N ); mbedtls_mpi_init( &P );
+    mbedtls_mpi_init( &Q ); mbedtls_mpi_init( &E );
 
     memset( &rnd_info,  0, sizeof( mbedtls_test_rnd_pseudo_info ) );
     memset( output,     0, sizeof( output ) );