1 files changed, 2 insertions, 1 deletions
diff --git a/app/ptp.c b/app/ptp.c
index 264918f..c05d0c3 100644
--- a/app/ptp.c
+++ b/app/ptp.c
@@ -80,11 +80,12 @@ uint64_t ptp_get (void)
 {
   uint32_t pl, ph;
 
-  ph = ETH_PTPTSHR;
 
   do {
+    ph = ETH_PTPTSHR;
     compiler_mb();
     pl = ETH_PTPTSLR;
+    compiler_mb();
   } while (ph != ETH_PTPTSHR);
 
   return ptp_to_u64 (pl, ph);