diff --git a/kernel/include/sortix/signal.h b/kernel/include/sortix/signal.h
index d1213e76..a0a24fb2 100644
--- a/kernel/include/sortix/signal.h
+++ b/kernel/include/sortix/signal.h
@@ -32,7 +32,7 @@ __BEGIN_DECLS
 #define SIGHUP      1 /* Hangup */
 #define SIGINT      2 /* Interrupt */
 #define SIGQUIT     3 /* Quit */
-#define SIGILL      4 /* Illegal instruction */
+#define SIGILL      4 /* Invalid instruction */
 #define SIGTRAP     5 /* Trace/breakpoint trap */
 #define SIGABRT     6 /* Aborted */
 #define SIGBUS      7 /* Bus Error */
diff --git a/libc/string/strerror.cpp b/libc/string/strerror.cpp
index 003a0bfa..22ab619e 100644
--- a/libc/string/strerror.cpp
+++ b/libc/string/strerror.cpp
@@ -58,7 +58,7 @@ extern "C" const char* sortix_strerror(int errnum)
 	case ENOTEMPTY: return "Directory not empty";
 	case EBUSY: return "Device or resource busy";
 	case EPIPE: return "Broken pipe";
-	case EILSEQ: return "Illegal byte sequence";
+	case EILSEQ: return "Invalid byte sequence";
 	case ELAKE: return "Sit by a lake";
 	case EMFILE: return "Too many open files";
 	case EAGAIN: return "Resource temporarily unavailable";
diff --git a/libc/string/strsignal.cpp b/libc/string/strsignal.cpp
index 255c5a6a..56981ab6 100644
--- a/libc/string/strsignal.cpp
+++ b/libc/string/strsignal.cpp
@@ -33,7 +33,7 @@ extern "C" const char* sortix_strsignal(int signum)
 	case SIGHUP: return "Hangup";
 	case SIGINT: return "Interrupt";
 	case SIGQUIT: return "Quit";
-	case SIGILL: return "Illegal instruction";
+	case SIGILL: return "Invalid instruction";
 	case SIGTRAP: return "Trace/breakpoint trap";
 	case SIGABRT: return "Aborted";
 	case SIGBUS: return "Bus Error";