diff --git a/src/arch/arduino-nano/arch.cc b/src/arch/arduino-nano/arch.cc
index 9103d10465d2ac7894942d59327cefe8d1b9d2d7..221ef5b34e66166388769a8c1751cea4648ff2e8 100644
--- a/src/arch/arduino-nano/arch.cc
+++ b/src/arch/arduino-nano/arch.cc
@@ -103,12 +103,12 @@ void Arch::idle(void)
 	asm("wdr");
 }
 
-inline void Arch::delay_us(unsigned int const us)
+void Arch::delay_us(unsigned int const us)
 {
 	_delay_us(us);
 }
 
-inline void Arch::delay_ms(unsigned int const ms)
+void Arch::delay_ms(unsigned int const ms)
 {
 	_delay_ms(ms);
 }