diff --git a/ir-parse.c b/ir-parse.c
index 0287337..517de45 100644
--- a/ir-parse.c
+++ b/ir-parse.c
@@ -240,7 +240,8 @@
 		json_object_object_get(section_descriptor_ir, "fruText");
 	if (fru_text != NULL) {
 		strncpy(descriptor->FruString, json_object_get_string(fru_text),
-			20);
+			sizeof(descriptor->FruString) - 1);
+		descriptor->FruString[sizeof(descriptor->FruString) - 1] = '\0';
 	}
 }