diff --git a/arch/arm/src/sama5/sam_adc.c b/arch/arm/src/sama5/sam_adc.c
index 965377194f6..8ad945879ce 100644
--- a/arch/arm/src/sama5/sam_adc.c
+++ b/arch/arm/src/sama5/sam_adc.c
@@ -1326,7 +1326,7 @@ static int sam_adc_settimer(struct sam_adc_s *priv, uint32_t frequency,
   priv->tc = sam_tc_allocate(channel, mode);
   if (!priv->tc)
     {
-      aerr("ERROR: Failed to allocate channel %d mode %08x\n",
+      aerr("ERROR: Failed to allocate channel %d mode %08" PRIx32 "\n",
             channel, mode);
       return -EINVAL;
     }
diff --git a/arch/arm/src/samv7/sam_afec.c b/arch/arm/src/samv7/sam_afec.c
index 62aa1ea86f1..c18ba5cfeae 100644
--- a/arch/arm/src/samv7/sam_afec.c
+++ b/arch/arm/src/samv7/sam_afec.c
@@ -542,7 +542,7 @@ static int sam_afec_settimer(struct samv7_dev_s *priv, uint32_t frequency,
   priv->tc = sam_tc_allocate(channel, mode);
   if (!priv->tc)
     {
-      aerr("ERROR: Failed to allocate channel %d mode %08lx\n",
+      aerr("ERROR: Failed to allocate channel %d mode %08" PRIx32 "\n",
             channel, mode);
       return -EINVAL;
     }
diff --git a/arch/arm/src/samv7/sam_dac.c b/arch/arm/src/samv7/sam_dac.c
index 73dfdc3a4cd..f67d57a6bb9 100644
--- a/arch/arm/src/samv7/sam_dac.c
+++ b/arch/arm/src/samv7/sam_dac.c
@@ -388,7 +388,7 @@ static int dac_timer_init(struct sam_dac_s *priv, uint32_t freq_required,
   priv->tc = sam_tc_allocate(channel, mode);
   if (!priv->tc)
     {
-      aerr("ERROR: Failed to allocate channel %d mode %08x\n",
+      aerr("ERROR: Failed to allocate channel %d mode %08" PRIx32 "\n",
             channel, mode);
       return -EINVAL;
     }