diff --git a/arch/arm/src/sam34/sam4cm_freerun.c b/arch/arm/src/sam34/sam4cm_freerun.c
index 386417109ca..1deb4c37105 100644
--- a/arch/arm/src/sam34/sam4cm_freerun.c
+++ b/arch/arm/src/sam34/sam4cm_freerun.c
@@ -85,7 +85,7 @@
 static void sam_freerun_handler(TC_HANDLE tch, void *arg, uint32_t sr)
 {
   struct sam_freerun_s *freerun = (struct sam_freerun_s *)arg;
-  DEBUGASSERT(freerun && freerun->overflow < UINT16_MAX);
+  DEBUGASSERT(freerun && freerun->overflow < UINT32_MAX);
   freerun->overflow++;
 }
 
diff --git a/arch/arm/src/sam34/sam4cm_freerun.h b/arch/arm/src/sam34/sam4cm_freerun.h
index 052f9ef6f57..da4d56a8436 100644
--- a/arch/arm/src/sam34/sam4cm_freerun.h
+++ b/arch/arm/src/sam34/sam4cm_freerun.h
@@ -63,7 +63,7 @@ struct sam_freerun_s
 {
   uint8_t chan;              /* The timer/counter in use */
   bool running;              /* True: the timer is running */
-  uint16_t overflow;         /* Timer counter overflow */
+  uint32_t overflow;         /* Timer counter overflow */
   TC_HANDLE tch;             /* Handle returned by sam_tc_initialize() */
 };