diff --git a/library/psa_crypto.c b/library/psa_crypto.c
index da6bd61..d512d4c 100644
--- a/library/psa_crypto.c
+++ b/library/psa_crypto.c
@@ -242,7 +242,7 @@
         case MBEDTLS_ERR_GCM_AUTH_FAILED:
             return( PSA_ERROR_INVALID_SIGNATURE );
         case MBEDTLS_ERR_GCM_BAD_INPUT:
-            return( PSA_ERROR_NOT_SUPPORTED );
+            return( PSA_ERROR_INVALID_ARGUMENT );
         case MBEDTLS_ERR_GCM_HW_ACCEL_FAILED:
             return( PSA_ERROR_HARDWARE_FAILURE );