diff --git a/enchive.c b/enchive.c
index b6229fe..dd334e7 100644
--- a/enchive.c
+++ b/enchive.c
@@ -302,7 +302,7 @@ get_passphrase(char *buf, size_t len, char *prompt)
 
 /* fallback to standard open */
 static FILE *
-secure_creat(char *file)
+secure_creat(const char *file)
 {
     return fopen(file, "wb");
 }
@@ -310,7 +310,7 @@ secure_creat(char *file)
 #else
 /* fallback to standard open */
 static FILE *
-secure_creat(char *file)
+secure_creat(const char *file)
 {
     return fopen(file, "wb");
 }