diff --git a/abstract-machine/klib/src/stdlib.c b/abstract-machine/klib/src/stdlib.c
index 382635d..e421ca7 100644
--- a/abstract-machine/klib/src/stdlib.c
+++ b/abstract-machine/klib/src/stdlib.c
@@ -29,12 +29,16 @@ int atoi(const char* nptr) {
   return x;
 }
 
+static uint8_t* ptr;
 void *malloc(size_t size) {
   // On native, malloc() will be called during initializaion of C runtime.
   // Therefore do not call panic() here, else it will yield a dead recursion:
   //   panic() -> putchar() -> (glibc) -> malloc() -> panic()
 #if !(defined(__ISA_NATIVE__) && defined(__NATIVE_USE_KLIB__))
-  panic("Not implemented");
+  if (ptr == NULL) ptr = heap.start;
+  // assert(ptr + size <= heap.end && ptr >= heap.start);
+  ptr += size;
+  return ptr - size;
 #endif
   return NULL;
 }