diff --git a/library/psa_its_file.c b/library/psa_its_file.c
index 3f32d7d..9567137 100644
--- a/library/psa_its_file.c
+++ b/library/psa_its_file.c
@@ -98,14 +98,9 @@
         return PSA_ERROR_DATA_CORRUPT;
     }
 
-    p_info->size = (header.size[0] |
-                    header.size[1] << 8 |
-                    header.size[2] << 16 |
-                    header.size[3] << 24);
-    p_info->flags = (header.flags[0] |
-                     header.flags[1] << 8 |
-                     header.flags[2] << 16 |
-                     header.flags[3] << 24);
+    p_info->size  = MBEDTLS_GET_UINT32_LE(header.size, 0);
+    p_info->flags = MBEDTLS_GET_UINT32_LE(header.flags, 0);
+
     return PSA_SUCCESS;
 }