diff --git a/src/sim/syscall_emul.cc b/src/sim/syscall_emul.cc
index 4ab472aaf0..731cf247e4 100644
--- a/src/sim/syscall_emul.cc
+++ b/src/sim/syscall_emul.cc
@@ -613,12 +613,10 @@ truncate64Func(SyscallDesc *desc, int num, ThreadContext *tc,
 }
 
 SyscallReturn
-ftruncate64Func(SyscallDesc *desc, int num, ThreadContext *tc)
+ftruncate64Func(SyscallDesc *desc, int num, ThreadContext *tc,
+                int tgt_fd, int64_t length)
 {
-    int index = 0;
     auto p = tc->getProcessPtr();
-    int tgt_fd = p->getSyscallArg(tc, index);
-    int64_t length = p->getSyscallArg(tc, index, 64);
 
     auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]);
     if (!ffdp)
diff --git a/src/sim/syscall_emul.hh b/src/sim/syscall_emul.hh
index 6be574ac88..74ffd761fc 100644
--- a/src/sim/syscall_emul.hh
+++ b/src/sim/syscall_emul.hh
@@ -235,8 +235,8 @@ SyscallReturn truncate64Func(SyscallDesc *desc, int num, ThreadContext *tc,
                              Addr pathname, int64_t length);
 
 /// Target ftruncate64() handler.
-SyscallReturn ftruncate64Func(SyscallDesc *desc, int num, ThreadContext *tc);
-
+SyscallReturn ftruncate64Func(SyscallDesc *desc, int num, ThreadContext *tc,
+                              int tgt_fd, int64_t length);
 
 /// Target umask() handler.
 SyscallReturn umaskFunc(SyscallDesc *desc, int num, ThreadContext *tc);