diff --git a/System/Jakt/OS.HC b/System/Jakt/OS.HC
index 88cd0cc..b8b6e0c 100644
--- a/System/Jakt/OS.HC
+++ b/System/Jakt/OS.HC
@@ -9,20 +9,13 @@ U0 _Z8os_blinkPKc()
     POP_SYSV_REGS
 }
 
-U64 @os_call(U8* function_name, U64 arg)
+U64 @os_call(U64 addr, U64 val)
 {
-    if (!function_name)
+    if (!addr || !val)
         return NULL;
-    if (!StrLen(function_name))
-        return NULL;
-    CHash* h = HashFind(function_name, Fs->hash_table, Fs->hash_table->mask);
-    if (!h)
-        return NULL;
-    if (h->type & HTT_FUN == HTT_FUN) {
-        CallInd(h(CHashFun*)->exe_addr, arg);
-    } else {
-        return NULL;
-    }
+    U64 (*func)(U64 arg);
+    func = addr;
+    return func(val);
 }
 
 U0 _Z7os_callmm()