diff --git a/src/tp_magic_api.h.in b/src/tp_magic_api.h.in
index 095937946..b677b5ff3 100644
--- a/src/tp_magic_api.h.in
+++ b/src/tp_magic_api.h.in
@@ -203,7 +203,7 @@ enum {
 
 #define MAGIC_COMPLEXITY_DEFAULT MAGIC_COMPLEXITY_ADVANCED
 
-char * MAGIC_COMPLEXITY_LEVEL_NAMES[NUM_MAGIC_COMPLEXITY_LEVELS] = {
+const char * MAGIC_COMPLEXITY_LEVEL_NAMES[NUM_MAGIC_COMPLEXITY_LEVELS] = {
   "novice",
   "beginner",
   "advanced",