diff --git a/qiling/os/posix/syscall/signal.py b/qiling/os/posix/syscall/signal.py
index 1591cb558..630cb5e9e 100644
--- a/qiling/os/posix/syscall/signal.py
+++ b/qiling/os/posix/syscall/signal.py
@@ -10,7 +10,7 @@
 
 from qiling.const import QL_ARCH
 from qiling.os import struct
-from qiling.os.posix.const import NSIG
+from qiling.os.posix.const import EINVAL, NSIG
 
 # TODO: MIPS differs in too many details around signals; MIPS implementation is better extracted out
 
@@ -122,7 +122,7 @@ def ql_syscall_rt_sigaction(ql: Qiling, signum: int, act: int, oldact: int):
     SIGSTOP = 23 if ql.arch.type is QL_ARCH.MIPS else 19
 
     if signum not in range(NSIG) or signum in (SIGKILL, SIGSTOP):
-        return -1   # EINVAL
+        return -EINVAL
 
     sigaction = __make_sigaction(ql.arch)