diff --git a/drivers/acpi/acpica/utnonansi.c b/drivers/acpi/acpica/utnonansi.c
index 3a7952be6545..93867ad7f342 100644
--- a/drivers/acpi/acpica/utnonansi.c
+++ b/drivers/acpi/acpica/utnonansi.c
@@ -168,7 +168,16 @@ void acpi_ut_safe_strncpy(char *dest, char *source, acpi_size dest_size)
 {
 	/* Always terminate destination string */
 
+#ifdef __KERNEL__
 	strscpy_pad(dest, source, dest_size);
+#else
+	/*
+	 * strscpy_pad() is not defined in ACPICA tools builds, so use strncpy()
+	 * and directly NUL-terminate the destination string in that case.
+	 */
+	strncpy(dest, source, dest_size);
+	dest[dest_size - 1] = 0;
+#endif
 }
 
 #endif