diff --git a/src/avr/timer.c b/src/avr/timer.c
index 0b248552..8cc3d550 100644
--- a/src/avr/timer.c
+++ b/src/avr/timer.c
@@ -69,7 +69,10 @@ static uint32_t timer_last;
 static __always_inline uint32_t
 calc_time(uint32_t last, uint16_t cur)
 {
-    union u32_u16_u calc;
+    union u32_u16_u {
+        struct { uint16_t lo, hi; };
+        uint32_t val;
+    } calc;
     calc.val = last;
     if (cur < calc.lo)
         calc.hi++;
diff --git a/src/compiler.h b/src/compiler.h
index ba4b83d5..7085f864 100644
--- a/src/compiler.h
+++ b/src/compiler.h
@@ -39,11 +39,6 @@
             (((x) + ((__divisor) / 2)) / (__divisor));  \
         })
 
-union u32_u16_u {
-    struct { uint16_t lo, hi; };
-    uint32_t val;
-};
-
 static inline void writel(void *addr, uint32_t val) {
     *(volatile uint32_t *)addr = val;
 }