1 files changed, 4 insertions, 2 deletions
diff --git a/lib/pammap.h b/lib/pammap.h
index f11b1d7a..a53a9c23 100644
--- a/lib/pammap.h
+++ b/lib/pammap.h
@@ -72,10 +72,12 @@ tupletable
 pnm_alloctupletable(const struct pam * const pamP, unsigned int const size);
 
 void
-pnm_freetupletable(struct pam * const pamP, tupletable const tupletable);
+pnm_freetupletable(const struct pam * const pamP,
+                   tupletable         const tupletable);
 
 void
-pnm_freetupletable2(struct pam * const pamP, tupletable2 const tupletable);
+pnm_freetupletable2(const struct pam * const pamP,
+                    tupletable2        const tupletable);
 
 tuplehash
 pnm_createtuplehash(void);