diff --git a/arch/arm/src/samv7/sam_us.c b/arch/arm/src/samv7/sam_us.c
index f3720f95a8b..87aab731666 100644
--- a/arch/arm/src/samv7/sam_us.c
+++ b/arch/arm/src/samv7/sam_us.c
@@ -98,6 +98,7 @@ int sam_erase_user_signature(void)
 
 int sam_write_user_signature(void *buffer, size_t buflen)
 {
+  irqstate_t flags;
   uint32_t *dest;
   int ret;
 
@@ -120,6 +121,7 @@ int sam_write_user_signature(void *buffer, size_t buflen)
    * within the internal memory area address space.
    */
 
+  flags = up_irq_save();
   dest = (uint32_t *)SAMV7_US_START;
   for (int i = 0; i < SAMV7_US_PAGE_WORDS; i++)
     {
@@ -134,6 +136,8 @@ int sam_write_user_signature(void *buffer, size_t buflen)
 
   up_clean_dcache(SAMV7_US_START, SAMV7_US_START + SAMV7_US_SIZE);
 
+  up_irq_restore(flags);
+
   /* EEFC_FCR_FARG does not have any affect for user signature,
    * therefore second argument can be zero.
    */
@@ -166,6 +170,7 @@ int sam_write_user_signature(void *buffer, size_t buflen)
 
 int sam_read_user_signature(void *buffer, size_t buflen)
 {
+  irqstate_t flags;
   size_t nwords;
   int ret;
 
@@ -180,7 +185,9 @@ int sam_read_user_signature(void *buffer, size_t buflen)
   /* sam_eefc_readsequence requires read length in bit words. */
 
   nwords = (buflen + sizeof(uint32_t)) / sizeof(uint32_t);
+  flags = up_irq_save();
   sam_eefc_readsequence(FCMD_STUS, FCMD_SPUS, g_page_buffer, nwords);
+  up_irq_restore(flags);
 
   /* Copy local buffer to void *buffer provided by the user. */