diff --git a/rfm69.c b/rfm69.c
index 4a60b51..70b66f4 100644
--- a/rfm69.c
+++ b/rfm69.c
@@ -157,8 +157,8 @@
     
     setMode(MODE_STDBY);
     
-    size_t len = fmin(regRead(FIFO), FIFO_SIZE) - 1;
-    len = fmin(len, size);
+    size_t len = min(regRead(FIFO), FIFO_SIZE) - 1;
+    len = min(len, size);
     
     // TODO assume and ignore address for now
     regRead(FIFO);
@@ -175,7 +175,7 @@
 
 size_t transmitPayload(uint8_t *payload, size_t size) {
     // payload + address byte
-    size_t len = fmin(size, FIFO_SIZE) + 1;
+    size_t len = min(size, FIFO_SIZE) + 1;
     
     spiSel();
     transmit(FIFO | 0x80);
diff --git a/rfm69.h b/rfm69.h
index 48d0e0b..8b1308f 100644
--- a/rfm69.h
+++ b/rfm69.h
@@ -9,7 +9,6 @@
 #define RFM69_H
 
 #include <stdbool.h>
-#include <math.h>
 #include <util/delay.h>
 
 #include "rfm69.h"
diff --git a/utils.h b/utils.h
index c2c880e..3d9a00b 100644
--- a/utils.h
+++ b/utils.h
@@ -2,7 +2,7 @@
  * File:   utils.h
  * Author: torsten.roemer@luniks.net
  *
- * Created on 14. April 2023, 00:14
+ * Created on 07. February 2025, 00:25
  */
 
 #ifndef UTILS_H
@@ -11,7 +11,30 @@
 /**
  * Computes the length of the given array.
  */
-#define ARRAY_LENGTH(array) (sizeof(array) / sizeof(array[0]))
+#define array_length(array) (sizeof(array) / sizeof(array[0]))
+
+/**
+ * Returns the greater of both given numbers.
+ * https://stackoverflow.com/questions/3437404/min-and-max-in-c
+ */
+#define max(a, b)            \
+({                           \
+    __typeof__ (a) _a = (a); \
+    __typeof__ (b) _b = (b); \
+    _a > _b ? _a : _b;       \
+})
+
+/**
+ * Returns the smaller of both given numbers.
+ * https://stackoverflow.com/questions/3437404/min-and-max-in-c
+ */
+#define min(a, b)            \
+({                           \
+    __typeof__ (a) _a = (a); \
+    __typeof__ (b) _b = (b); \
+    _a < _b ? _a : _b;       \
+})
+
 
 #endif /* UTILS_H */