diff --git a/main_test.go b/main_test.go
index 58ad63b9..607f109b 100644
--- a/main_test.go
+++ b/main_test.go
@@ -171,9 +171,6 @@ func TestCompiler(t *testing.T) {
 			case "float.go", "math.go", "print.go":
 				// Stuck in runtime.printfloat64.
 
-			case "goroutines.go":
-				// The main() never runs.
-
 			case "interface.go":
 				// Several comparison tests fail.
 
diff --git a/src/runtime/runtime_arm7tdmi.go b/src/runtime/runtime_arm7tdmi.go
index 3938506b..3b383c32 100644
--- a/src/runtime/runtime_arm7tdmi.go
+++ b/src/runtime/runtime_arm7tdmi.go
@@ -28,8 +28,6 @@ var _sidata [0]byte
 //go:extern _edata
 var _edata [0]byte
 
-func postinit() {}
-
 // Entry point for Go. Initialize all packages and call main.main().
 //export main
 func main() {
diff --git a/src/runtime/runtime_atsamd21.go b/src/runtime/runtime_atsamd21.go
index 32ed1cea..c4147c80 100644
--- a/src/runtime/runtime_atsamd21.go
+++ b/src/runtime/runtime_atsamd21.go
@@ -13,8 +13,6 @@ import (
 
 type timeUnit int64
 
-func postinit() {}
-
 //export Reset_Handler
 func main() {
 	preinit()
diff --git a/src/runtime/runtime_atsamd51.go b/src/runtime/runtime_atsamd51.go
index ec704471..3561050b 100644
--- a/src/runtime/runtime_atsamd51.go
+++ b/src/runtime/runtime_atsamd51.go
@@ -12,8 +12,6 @@ import (
 
 type timeUnit int64
 
-func postinit() {}
-
 //export Reset_Handler
 func main() {
 	arm.SCB.CPACR.Set(0) // disable FPU if it is enabled
diff --git a/src/runtime/runtime_avr.go b/src/runtime/runtime_avr.go
index 72b14106..75102044 100644
--- a/src/runtime/runtime_avr.go
+++ b/src/runtime/runtime_avr.go
@@ -42,6 +42,7 @@ var _ebss [0]byte
 //export main
 func main() {
 	preinit()
+	initHardware()
 	run()
 	exit(0)
 }
@@ -55,15 +56,13 @@ func preinit() {
 	}
 }
 
-func postinit() {
-	// Enable interrupts after initialization.
-	avr.Asm("sei")
-}
-
-func init() {
+func initHardware() {
 	initUART()
 	machine.InitMonotonicTimer()
 	nextTimerRecalibrate = ticks() + timerRecalibrateInterval
+
+	// Enable interrupts after initialization.
+	avr.Asm("sei")
 }
 
 func ticksToNanoseconds(ticks timeUnit) int64 {
diff --git a/src/runtime/runtime_cortexm_qemu.go b/src/runtime/runtime_cortexm_qemu.go
index 2d7e78f3..07eef706 100644
--- a/src/runtime/runtime_cortexm_qemu.go
+++ b/src/runtime/runtime_cortexm_qemu.go
@@ -15,8 +15,6 @@ type timeUnit int64
 
 var timestamp timeUnit
 
-func postinit() {}
-
 //export Reset_Handler
 func main() {
 	preinit()
diff --git a/src/runtime/runtime_esp32xx.go b/src/runtime/runtime_esp32xx.go
index 54dadab8..b3270ac3 100644
--- a/src/runtime/runtime_esp32xx.go
+++ b/src/runtime/runtime_esp32xx.go
@@ -14,8 +14,6 @@ func putchar(c byte) {
 	machine.Serial.WriteByte(c)
 }
 
-func postinit() {}
-
 // Initialize .bss: zero-initialized global variables.
 // The .data section has already been loaded by the ROM bootloader.
 func clearbss() {
diff --git a/src/runtime/runtime_esp8266.go b/src/runtime/runtime_esp8266.go
index aa698aed..936b99a4 100644
--- a/src/runtime/runtime_esp8266.go
+++ b/src/runtime/runtime_esp8266.go
@@ -23,8 +23,6 @@ func putchar(c byte) {
 //export rom_i2c_writeReg
 func rom_i2c_writeReg(block, host_id, reg_add, data uint8)
 
-func postinit() {}
-
 //export main
 func main() {
 	// Clear .bss section. .data has already been loaded by the ROM bootloader.
diff --git a/src/runtime/runtime_fe310.go b/src/runtime/runtime_fe310.go
index 33d8e483..c09dfe81 100644
--- a/src/runtime/runtime_fe310.go
+++ b/src/runtime/runtime_fe310.go
@@ -16,8 +16,6 @@ import (
 
 type timeUnit int64
 
-func postinit() {}
-
 //export main
 func main() {
 	// Zero the PLIC enable bits on startup: they are not zeroed at reset.
diff --git a/src/runtime/runtime_k210.go b/src/runtime/runtime_k210.go
index dc8ee044..2fb4fec6 100644
--- a/src/runtime/runtime_k210.go
+++ b/src/runtime/runtime_k210.go
@@ -15,8 +15,6 @@ import (
 
 type timeUnit int64
 
-func postinit() {}
-
 //export main
 func main() {
 
diff --git a/src/runtime/runtime_mimxrt1062.go b/src/runtime/runtime_mimxrt1062.go
index 6c1212cb..8a9f2b01 100644
--- a/src/runtime/runtime_mimxrt1062.go
+++ b/src/runtime/runtime_mimxrt1062.go
@@ -16,8 +16,6 @@ var _svectors [0]byte
 //go:extern _flexram_cfg
 var _flexram_cfg [0]byte
 
-func postinit() {}
-
 //export Reset_Handler
 func main() {
 
diff --git a/src/runtime/runtime_nintendoswitch.go b/src/runtime/runtime_nintendoswitch.go
index 99cb3b0b..0267b541 100644
--- a/src/runtime/runtime_nintendoswitch.go
+++ b/src/runtime/runtime_nintendoswitch.go
@@ -43,8 +43,6 @@ var (
 	totalHeap = uint64(0)
 )
 
-func postinit() {}
-
 func preinit() {
 	// Unsafe to use heap here
 	setupEnv()
diff --git a/src/runtime/runtime_nrf.go b/src/runtime/runtime_nrf.go
index 551078b8..dfbc76e1 100644
--- a/src/runtime/runtime_nrf.go
+++ b/src/runtime/runtime_nrf.go
@@ -15,8 +15,6 @@ type timeUnit int64
 //go:linkname systemInit SystemInit
 func systemInit()
 
-func postinit() {}
-
 //export Reset_Handler
 func main() {
 	if nrf.FPUPresent {
diff --git a/src/runtime/runtime_nxpmk66f18.go b/src/runtime/runtime_nxpmk66f18.go
index c54ab377..02a9bb59 100644
--- a/src/runtime/runtime_nxpmk66f18.go
+++ b/src/runtime/runtime_nxpmk66f18.go
@@ -226,8 +226,6 @@ func initInternal() {
 	// 	analog_init();
 }
 
-func postinit() {}
-
 func putchar(c byte) {
 	machine.PutcharUART(machine.UART0, c)
 }
diff --git a/src/runtime/runtime_rp2040.go b/src/runtime/runtime_rp2040.go
index 4d615a14..38f6d304 100644
--- a/src/runtime/runtime_rp2040.go
+++ b/src/runtime/runtime_rp2040.go
@@ -53,8 +53,6 @@ func init() {
 	machine.Serial.Configure(machine.UARTConfig{})
 }
 
-func postinit() {}
-
 //export Reset_Handler
 func main() {
 	preinit()
diff --git a/src/runtime/runtime_stm32.go b/src/runtime/runtime_stm32.go
index 08dde0dd..aabffa2a 100644
--- a/src/runtime/runtime_stm32.go
+++ b/src/runtime/runtime_stm32.go
@@ -6,8 +6,6 @@ import "device/arm"
 
 type timeUnit int64
 
-func postinit() {}
-
 //export Reset_Handler
 func main() {
 	preinit()
diff --git a/src/runtime/runtime_tinygoriscv_qemu.go b/src/runtime/runtime_tinygoriscv_qemu.go
index 04e41b81..8558f41e 100644
--- a/src/runtime/runtime_tinygoriscv_qemu.go
+++ b/src/runtime/runtime_tinygoriscv_qemu.go
@@ -15,8 +15,6 @@ type timeUnit int64
 
 var timestamp timeUnit
 
-func postinit() {}
-
 //export main
 func main() {
 	preinit()
diff --git a/src/runtime/runtime_tinygowasm.go b/src/runtime/runtime_tinygowasm.go
index 80eaa8d3..a5b1b3c8 100644
--- a/src/runtime/runtime_tinygowasm.go
+++ b/src/runtime/runtime_tinygowasm.go
@@ -22,8 +22,6 @@ func fd_write(id uint32, iovs *__wasi_iovec_t, iovs_len uint, nwritten *uint) (e
 //export proc_exit
 func proc_exit(exitcode uint32)
 
-func postinit() {}
-
 const (
 	putcharBufferSize = 120
 	stdout            = 1
diff --git a/src/runtime/runtime_unix.go b/src/runtime/runtime_unix.go
index 5b9161dd..fe8c0cac 100644
--- a/src/runtime/runtime_unix.go
+++ b/src/runtime/runtime_unix.go
@@ -65,8 +65,6 @@ type timespec struct {
 
 var stackTop uintptr
 
-func postinit() {}
-
 // Entry point for Go. Initialize all packages and call main.main().
 //export main
 func main(argc int32, argv *unsafe.Pointer) int {
diff --git a/src/runtime/runtime_windows.go b/src/runtime/runtime_windows.go
index 6872992d..851f40f7 100644
--- a/src/runtime/runtime_windows.go
+++ b/src/runtime/runtime_windows.go
@@ -41,8 +41,6 @@ func __p___argc() *int32
 //export __p___argv
 func __p___argv() **unsafe.Pointer
 
-func postinit() {}
-
 //export mainCRTStartup
 func mainCRTStartup() int {
 	preinit()
diff --git a/src/runtime/scheduler_any.go b/src/runtime/scheduler_any.go
index e0597dc3..d8097915 100644
--- a/src/runtime/scheduler_any.go
+++ b/src/runtime/scheduler_any.go
@@ -22,7 +22,6 @@ func run() {
 	initHeap()
 	go func() {
 		initAll()
-		postinit()
 		callMain()
 		schedulerDone = true
 	}()
diff --git a/src/runtime/scheduler_none.go b/src/runtime/scheduler_none.go
index b037dae0..2086e422 100644
--- a/src/runtime/scheduler_none.go
+++ b/src/runtime/scheduler_none.go
@@ -23,7 +23,6 @@ func getSystemStackPointer() uintptr {
 func run() {
 	initHeap()
 	initAll()
-	postinit()
 	callMain()
 }