diff --git a/tools/testing/selftests/kselftest.h b/tools/testing/selftests/kselftest.h
index e8eecbc83a60..ad7b97e16f37 100644
--- a/tools/testing/selftests/kselftest.h
+++ b/tools/testing/selftests/kselftest.h
@@ -48,6 +48,7 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <stdarg.h>
+#include <string.h>
 #include <stdio.h>
 #include <sys/utsname.h>
 #endif
@@ -156,6 +157,19 @@ static inline void ksft_print_msg(const char *msg, ...)
 	va_end(args);
 }
 
+static inline void ksft_perror(const char *msg)
+{
+#ifndef NOLIBC
+	ksft_print_msg("%s: %s (%d)\n", msg, strerror(errno), errno);
+#else
+	/*
+	 * nolibc doesn't provide strerror() and it seems
+	 * inappropriate to add one, just print the errno.
+	 */
+	ksft_print_msg("%s: %d)\n", msg, errno);
+#endif
+}
+
 static inline void ksft_test_result_pass(const char *msg, ...)
 {
 	int saved_errno = errno;