diff --git a/lib/MiLight/PacketFormatter.cpp b/lib/MiLight/PacketFormatter.cpp
index 333c0872..396b58e3 100644
--- a/lib/MiLight/PacketFormatter.cpp
+++ b/lib/MiLight/PacketFormatter.cpp
@@ -171,12 +171,12 @@ void PacketFormatter::format(uint8_t const* packet, char* buffer) {
 }
 
 void PacketFormatter::formatV1Packet(uint8_t const* packet, char* buffer) {
-  buffer += sprintf_P(buffer, "Request type  : %02X\n", packet[0]) ;
-  buffer += sprintf_P(buffer, "Device ID     : %02X%02X\n", packet[1], packet[2]);
-  buffer += sprintf_P(buffer, "b1            : %02X\n", packet[3]);
-  buffer += sprintf_P(buffer, "b2            : %02X\n", packet[4]);
-  buffer += sprintf_P(buffer, "b3            : %02X\n", packet[5]);
-  buffer += sprintf_P(buffer, "Sequence Num. : %02X", packet[6]);
+  buffer += sprintf_P(buffer, PSTR("Request type  : %02X\n"), packet[0]) ;
+  buffer += sprintf_P(buffer, PSTR("Device ID     : %02X%02X\n"), packet[1], packet[2]);
+  buffer += sprintf_P(buffer, PSTR("b1            : %02X\n"), packet[3]);
+  buffer += sprintf_P(buffer, PSTR("b2            : %02X\n"), packet[4]);
+  buffer += sprintf_P(buffer, PSTR("b3            : %02X\n"), packet[5]);
+  buffer += sprintf_P(buffer, PSTR("Sequence Num. : %02X"), packet[6]);
 }
 
 size_t PacketFormatter::getPacketLength() const {
diff --git a/lib/MiLight/RgbPacketFormatter.cpp b/lib/MiLight/RgbPacketFormatter.cpp
index 94da1b37..5a58fbb3 100644
--- a/lib/MiLight/RgbPacketFormatter.cpp
+++ b/lib/MiLight/RgbPacketFormatter.cpp
@@ -120,9 +120,9 @@ BulbId RgbPacketFormatter::parsePacket(const uint8_t* packet, JsonObject result)
 }
 
 void RgbPacketFormatter::format(uint8_t const* packet, char* buffer) {
-  buffer += sprintf_P(buffer, "b0       : %02X\n", packet[0]);
-  buffer += sprintf_P(buffer, "ID       : %02X%02X\n", packet[1], packet[2]);
-  buffer += sprintf_P(buffer, "Color    : %02X\n", packet[3]);
-  buffer += sprintf_P(buffer, "Command  : %02X\n", packet[4]);
-  buffer += sprintf_P(buffer, "Sequence : %02X\n", packet[5]);
+  buffer += sprintf_P(buffer, PSTR("b0       : %02X\n"), packet[0]);
+  buffer += sprintf_P(buffer, PSTR("ID       : %02X%02X\n"), packet[1], packet[2]);
+  buffer += sprintf_P(buffer, PSTR("Color    : %02X\n"), packet[3]);
+  buffer += sprintf_P(buffer, PSTR("Command  : %02X\n"), packet[4]);
+  buffer += sprintf_P(buffer, PSTR("Sequence : %02X\n"), packet[5]);
 }