diff --git a/arch/aarch64.c b/arch/aarch64.c
index 4b5d9ba..f90935a 100644
--- a/arch/aarch64.c
+++ b/arch/aarch64.c
@@ -78,4 +78,25 @@ uint32_t fork(){
   return (uint32_t)rtn;
 }
 
+int32_t openat(int32_t fd, const char* filename, uint32_t flags, uint32_t mode) {
+  long int rtn;
+  asm volatile (
+    // Assembly Instructions
+    "mov x8, #56\n"  // Syscall number for 'openat' is 56 in AArch64
+    "mov x0, %1\n"    // dir fd
+    "mov x1, %2\n"    // file path
+    "mov x2, %3\n"    // flags
+    "mov x3, %4\n"    // mode
+    "svc #0\n"        // Make the syscall
+    "mov %0, x0\n"    // save return value
+    // Output operands
+    : "=r" (rtn)
+    // Input operand
+    : "r" ((int64_t)fd), "r"(filename), "r"((int64_t)flags), "r"((int64_t)mode)
+    // Clobbered registers
+    : "x0", "x1", "x2", "x3", "x8"
+  );
+  return (int32_t)rtn;
+}
+
 #endif
diff --git a/buildtest.c b/buildtest.c
index ab2c52f..097309f 100644
--- a/buildtest.c
+++ b/buildtest.c
@@ -33,14 +33,16 @@ int main() {
   write(STDIO, input_buffer, n_read);
 
   // Test the open syscall
-  #if defined(__x86_64__) || defined(__mips__)
   int32_t file = open("/proc/version", O_RDONLY);
-  int i = read(file, input_buffer, INPUT_BUFFER_LEN);
-  while(i > 0) {
-    write(STDIO, input_buffer, i);
-    i = read(file, input_buffer, INPUT_BUFFER_LEN);
+  if (file > 0) {
+    int i = read(file, input_buffer, INPUT_BUFFER_LEN);
+    while(i > 0) {
+      write(STDIO, input_buffer, i);
+      i = read(file, input_buffer, INPUT_BUFFER_LEN);
+    }
+  } else {
+    write(STDIO, "Could not open /proc/version\n", 29);
   }
-  #endif
   return 69;
 }