diff --git a/examples/UnitUnified/NFCA/Detect/main/Detect.cpp b/examples/UnitUnified/NFCA/Detect/main/Detect.cpp
index 20653b2..a949fd0 100644
--- a/examples/UnitUnified/NFCA/Detect/main/Detect.cpp
+++ b/examples/UnitUnified/NFCA/Detect/main/Detect.cpp
@@ -142,7 +142,7 @@ void loop()
             if (nfc_a.identify(u)) {
                 M5.Log.printf("PICC:%s %s %04X/%02X %u/%u\n", u.uidAsString().c_str(), u.typeAsString().c_str(), u.atqa,
                               u.sak, u.userAreaSize(), u.totalSize());
-                lcd.printf("[%2u]:PICC:<%s> %s\n", idx, u.uidAsString().c_str(), u.typeAsString().c_str());
+                lcd.printf("[%2u]:PICC:<%s> %s\n", static_cast<unsigned>(idx), u.uidAsString().c_str(), u.typeAsString().c_str());
                 ++idx;
             } else {
                 M5_LOGW("Failed to identify %s %s %04X/%02X %u/%u", u.uidAsString().c_str(), u.typeAsString().c_str(),
diff --git a/examples/UnitUnified/NFCB/Detect/main/Detect.cpp b/examples/UnitUnified/NFCB/Detect/main/Detect.cpp
index ea0b877..02b9e5a 100644
--- a/examples/UnitUnified/NFCB/Detect/main/Detect.cpp
+++ b/examples/UnitUnified/NFCB/Detect/main/Detect.cpp
@@ -117,7 +117,7 @@ void loop()
         uint32_t idx{};
         for (auto&& u : piccs) {
             M5.Log.printf("PICC:%s %s\n", u.pupiAsString().c_str(), u.typeAsString().c_str());
-            lcd.printf("[%2u]:PICC:<%s>%s\n", idx, u.pupiAsString().c_str(), u.typeAsString().c_str());
+            lcd.printf("[%2u]:PICC:<%s>%s\n", static_cast<unsigned>(idx), u.pupiAsString().c_str(), u.typeAsString().c_str());
             ++idx;
         }
     }
diff --git a/examples/UnitUnified/NFCV/Detect/main/Detect.cpp b/examples/UnitUnified/NFCV/Detect/main/Detect.cpp
index 253a0cd..4c3c928 100644
--- a/examples/UnitUnified/NFCV/Detect/main/Detect.cpp
+++ b/examples/UnitUnified/NFCV/Detect/main/Detect.cpp
@@ -117,7 +117,7 @@ void loop()
         uint32_t idx{};
         for (auto&& u : piccs) {
             M5.Log.printf("PICC:%s %s %u\n", u.uidAsString().c_str(), u.typeAsString().c_str(), u.totalSize());
-            lcd.printf("[%2u]:PICC:<%s> %s\n", idx, u.uidAsString().c_str(), u.typeAsString().c_str());
+            lcd.printf("[%2u]:PICC:<%s> %s\n", static_cast<unsigned>(idx), u.uidAsString().c_str(), u.typeAsString().c_str());
             ++idx;
         }
     }