diff --git a/programs/fuzz/fuzz_privkey.c b/programs/fuzz/fuzz_privkey.c
index 533a647dc..3685592f3 100644
--- a/programs/fuzz/fuzz_privkey.c
+++ b/programs/fuzz/fuzz_privkey.c
@@ -29,7 +29,9 @@ int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
             mbedtls_mpi_init( &DQ ); mbedtls_mpi_init( &QP );
 
             rsa = mbedtls_pk_rsa( pk );
-            mbedtls_rsa_export( rsa, &N, &P, &Q, &D, &E );
+            if ( mbedtls_rsa_export( rsa, &N, &P, &Q, &D, &E ) != 0 ) {
+                abort();
+            }
             mbedtls_rsa_export_crt( rsa, &DP, &DQ, &QP );
 
             mbedtls_mpi_free( &N ); mbedtls_mpi_free( &P ); mbedtls_mpi_free( &Q );
diff --git a/programs/fuzz/fuzz_pubkey.c b/programs/fuzz/fuzz_pubkey.c
index df42f7d53..3a59125bd 100644
--- a/programs/fuzz/fuzz_pubkey.c
+++ b/programs/fuzz/fuzz_pubkey.c
@@ -20,7 +20,9 @@ int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
             mbedtls_mpi_init( &DQ ); mbedtls_mpi_init( &QP );
 
             rsa = mbedtls_pk_rsa( pk );
-            ret = mbedtls_rsa_export( rsa, &N, &P, &Q, &D, &E );
+            if ( mbedtls_rsa_export( rsa, &N, &P, &Q, &D, &E ) != 0 ) {
+                abort();
+            }
             ret = mbedtls_rsa_export_crt( rsa, &DP, &DQ, &QP );
 
             mbedtls_mpi_free( &N ); mbedtls_mpi_free( &P ); mbedtls_mpi_free( &Q );