diff --git a/esp32/uwb_anchor/platformio.ini b/esp32/uwb_anchor/platformio.ini
index a4f32c2..3d72e68 100644
--- a/esp32/uwb_anchor/platformio.ini
+++ b/esp32/uwb_anchor/platformio.ini
@@ -14,6 +14,7 @@ upload_speed  = 921600
 lib_extra_dirs = ../../lib
 build_flags =
     -DCORE_DEBUG_LEVEL=0
+    -Wno-error=return-type
 
 [env:anchor0]
 extends     = common
diff --git a/esp32/uwb_anchor/src/main.cpp b/esp32/uwb_anchor/src/main.cpp
index 40f7ab6..c208949 100644
--- a/esp32/uwb_anchor/src/main.cpp
+++ b/esp32/uwb_anchor/src/main.cpp
@@ -37,9 +37,9 @@
 
 /* Unique DW1000 address per anchor (last 2 bytes differ) */
 #if ANCHOR_ID == 0
-#  define ANCHOR_ADDR "86:17:5B:D5:A9:9A:E2:00"
+static char ANCHOR_ADDR[] = "86:17:5B:D5:A9:9A:E2:00";
 #else
-#  define ANCHOR_ADDR "86:17:5B:D5:A9:9A:E2:01"
+static char ANCHOR_ADDR[] = "86:17:5B:D5:A9:9A:E2:01";
 #endif
 
 /* ── Pins (ESP32 UWB Pro, no display) ──────────────────────────── */
diff --git a/esp32/uwb_tag/platformio.ini b/esp32/uwb_tag/platformio.ini
index e4ca342..765e959 100644
--- a/esp32/uwb_tag/platformio.ini
+++ b/esp32/uwb_tag/platformio.ini
@@ -17,3 +17,4 @@ lib_deps =
 build_flags =
     -DCORE_DEBUG_LEVEL=0
     -DTAG_ID=0x01
+    -Wno-error=return-type
diff --git a/esp32/uwb_tag/src/main.cpp b/esp32/uwb_tag/src/main.cpp
index 375222d..0f0f737 100644
--- a/esp32/uwb_tag/src/main.cpp
+++ b/esp32/uwb_tag/src/main.cpp
@@ -44,7 +44,7 @@
 #  define TAG_ID  0x01
 #endif
 
-#define TAG_ADDR "7D:00:22:EA:82:60:3B:9B"
+static char TAG_ADDR[] = "7D:00:22:EA:82:60:3B:9B";
 
 #define SERIAL_BAUD  115200
 #define NUM_ANCHORS  2