diff --git a/src/worker/lib/arm32/crt0.c b/src/worker/lib/arm32/crt0.c
index 13c02637..541b6f19 100644
--- a/src/worker/lib/arm32/crt0.c
+++ b/src/worker/lib/arm32/crt0.c
@@ -1,4 +1,8 @@
 
+extern void _end;
+
+void malloc_addblock(void* addr, int size);
+
 int entry();
 
 __attribute__((weak, naked, noinline, noreturn)) void _start() {
@@ -8,6 +12,8 @@ __attribute__((weak, naked, noinline, noreturn)) void _start() {
     asm("__bss_end__ = _end");
     // set stack pointer
     asm("mov sp, #0x100000");
+    // allocate heap block
+    malloc_addblock(&_end, (void*)0xf0000 - &_end);
     // run main()
     entry();
     // wait for next video frame