diff --git a/libs/libc/include/luna/syscall.h b/libs/libc/include/luna/syscall.h
index 938008f0..3112cd0c 100644
--- a/libs/libc/include/luna/syscall.h
+++ b/libs/libc/include/luna/syscall.h
@@ -8,7 +8,7 @@ extern "C"
 {
 #endif
 
-    void __syscall0(int sys_num);
+    long int __syscall0(int sys_num);
 
 #ifdef __cplusplus
 }
diff --git a/libs/libc/src/luna/syscall.cpp b/libs/libc/src/luna/syscall.cpp
index 3328d381..c265638f 100644
--- a/libs/libc/src/luna/syscall.cpp
+++ b/libs/libc/src/luna/syscall.cpp
@@ -3,8 +3,10 @@
 
 extern "C"
 {
-    void __syscall0(int sys_num)
+    long int __syscall0(int sys_num)
     {
-        asm volatile("int $0x42" : : "a"(sys_num));
+        long int result;
+        asm volatile("int $0x42" : "=a"(result) : "a"(sys_num));
+        return result;
     }
 }
\ No newline at end of file