diff --git a/slang/sltermin.c b/slang/sltermin.c
index e03211c70..94119fd17 100644
--- a/slang/sltermin.c
+++ b/slang/sltermin.c
@@ -321,7 +321,7 @@ char *SLtt_tigetent (char *term)
 # define UNTIC_COMMENT(x)
 #endif
 
-typedef struct 
+typedef const struct
 {
    char name[3];
    int offset;