diff --git a/library/psa_crypto.c b/library/psa_crypto.c
index c890e12..4e1f41b 100644
--- a/library/psa_crypto.c
+++ b/library/psa_crypto.c
@@ -7374,6 +7374,9 @@
         if (bits > PSA_VENDOR_RSA_MAX_KEY_BITS) {
             return PSA_ERROR_NOT_SUPPORTED;
         }
+        if (bits < PSA_VENDOR_RSA_MIN_KEY_BITS) {
+            return PSA_ERROR_NOT_SUPPORTED;
+        }
 
         /* Accept only byte-aligned keys, for the same reasons as
          * in psa_import_rsa_key(). */