diff --git a/src/sim/syscall_emul.cc b/src/sim/syscall_emul.cc
index 3a0db1016..3f6c56b5f 100644
--- a/src/sim/syscall_emul.cc
+++ b/src/sim/syscall_emul.cc
@@ -385,7 +385,7 @@ umaskFunc(SyscallDesc *desc, int num, LiveProcess *process, ThreadContext *tc)
     // changing anything.
     mode_t oldMask = umask(0);
     umask(oldMask);
-    return oldMask;
+    return (int)oldMask;
 }
 
 SyscallReturn