diff --git a/libc/decl/errno_values.h b/libc/decl/errno_values.h
index d884e54b..239ac0b4 100644
--- a/libc/decl/errno_values.h
+++ b/libc/decl/errno_values.h
@@ -51,6 +51,7 @@
 #define EADDRINUSE 59
 #define ETIMEDOUT 60
 #define ECONNREFUSED 61
+#define EDOM 62
 
 #define EOPNOTSUPP ENOTSUP
 
diff --git a/libc/strerror.cpp b/libc/strerror.cpp
index 52e53fdd..41b83787 100644
--- a/libc/strerror.cpp
+++ b/libc/strerror.cpp
@@ -80,6 +80,7 @@ extern "C" const char* sortix_strerror(int errnum)
 	case EADDRINUSE: return "Address already in use";
 	case ETIMEDOUT: return "Connection timed out";
 	case ECONNREFUSED: return "Connection refused";
+	case EDOM: return "Mathematics argument out of domain of function";
 	default: return "Unknown error condition";
 	}
 }