diff --git a/programs/pkey/key_app.c b/programs/pkey/key_app.c
index 796f237..e6e9765 100644
--- a/programs/pkey/key_app.c
+++ b/programs/pkey/key_app.c
@@ -149,7 +149,7 @@
             fgets( buf, sizeof(buf), f );
             fclose( f );
 
-            i = strlen( buf );
+            i = (int) strlen( buf );
             if( buf[i - 1] == '\n' ) buf[i - 1] = '\0';
             if( buf[i - 2] == '\r' ) buf[i - 2] = '\0';
             opt.password = buf;