diff --git a/src/macsniff.cpp b/src/macsniff.cpp
index da69ba22..3595f18e 100644
--- a/src/macsniff.cpp
+++ b/src/macsniff.cpp
@@ -27,7 +27,7 @@ bool mac_add(uint8_t *paddr, int8_t rssi, bool sniff_type) {
     bool added = false;
     uint32_t addr2int, vendor2int;          // temporary buffer for MAC and Vendor OUI
 	uint16_t hashedmac;                     // temporary buffer for generated hash value
-    float memlevel;                         // % of used heap mem
+    uint8_t memlevel;                         // % of used heap mem
 
     // only last 3 MAC Address bytes are used for MAC address anonymization
     // but since it's uint32 we take 4 bytes to avoid 1st value to be 0
@@ -53,7 +53,7 @@ bool mac_add(uint8_t *paddr, int8_t rssi, bool sniff_type) {
     if (added) {
         // Display heap memory left
         memlevel = ESP.getFreeHeap() / heapmem * 100;
-        sprintf(display_mem, "%d%%", memlevel);
+        sprintf(display_mem, "%i%%", memlevel);
         // increment counter and one blink led
         if (sniff_type == MAC_SNIFF_WIFI ) {
             macs_wifi++; // increment Wifi MACs counter
diff --git a/src/main.cpp b/src/main.cpp
index 15dbc0dc..2e8b8d21 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -54,7 +54,7 @@ uint16_t LEDBlinkDuration = 0;      // How long the blink need to be
 uint16_t LEDColor = COLOR_NONE;     // state machine variable to set RGB LED color
 bool joinstate = false;             // LoRa network joined? global flag
 bool blinkdone = true;              // flag for state machine for blinking LED once
-const uint32_t heapmem = ESP.getFreeHeap();   // free heap memory after start (:= 100%)
+const uint32_t heapmem = ESP.getFreeHeap(); // free heap memory after start (:= 100%)
 
 std::set<uint16_t> macs; // associative container holds total of unique MAC adress hashes (Wifi + BLE)