diff --git a/fuzz/device/net/src/fuzz.cc b/fuzz/device/net/src/fuzz.cc
index 1013cf7f7..ea4943665 100644
--- a/fuzz/device/net/src/fuzz.cc
+++ b/fuzz/device/net/src/fuzz.cc
@@ -88,7 +88,7 @@ void net_task(FuzzedDataProvider *provider) {
   case kNetworkCanXmit:
  (void)tud_network_can_xmit(provider->ConsumeIntegral<uint16_t>());
   case kNetworkXmit:
-    // TODO: Actuall pass real values here later.
+    // TODO: Actually pass real values here later.
     tud_network_xmit(NULL, 0);
 
   case kMaxValue:
@@ -96,4 +96,4 @@ void net_task(FuzzedDataProvider *provider) {
     break;
   }
 }
-}
\ No newline at end of file
+}
diff --git a/fuzz/make.mk b/fuzz/make.mk
index 299d2c843..796ddc443 100644
--- a/fuzz/make.mk
+++ b/fuzz/make.mk
@@ -72,6 +72,7 @@ CFLAGS += \
   -O1
 
 CFLAGS += \
+	-Wno-error=unreachable-code \
   -DOPT_MCU_FUZZ=1 \
   -DCFG_TUSB_MCU=OPT_MCU_FUZZ 
 
diff --git a/src/class/cdc/cdc_device.c b/src/class/cdc/cdc_device.c
index 77c73030a..7b1e08d5d 100644
--- a/src/class/cdc/cdc_device.c
+++ b/src/class/cdc/cdc_device.c
@@ -171,6 +171,7 @@ uint32_t tud_cdc_n_write(uint8_t itf, void const* buffer, uint32_t bufsize)
   uint16_t ret = tu_fifo_write_n(&p_cdc->tx_ff, buffer, (uint16_t) bufsize);
 
   // flush if queue more than packet size
+  // may need to suppress -Wunreachable-code since most of the time CFG_TUD_CDC_TX_BUFSIZE < BULK_PACKET_SIZE
   if ( (tu_fifo_count(&p_cdc->tx_ff) >= BULK_PACKET_SIZE) || ((CFG_TUD_CDC_TX_BUFSIZE < BULK_PACKET_SIZE) && tu_fifo_full(&p_cdc->tx_ff)) )
   {
     tud_cdc_n_write_flush(itf);