diff --git a/lib/842/842_decompress.c b/lib/842/842_decompress.c
index 6b2b45aecde3f60e9bab79bfbdafd77a9ae1c463..dbeb0581b879b71b1c5a0d14652137dc70e40adb 100644
--- a/lib/842/842_decompress.c
+++ b/lib/842/842_decompress.c
@@ -214,7 +214,7 @@ static int __do_index(struct sw842_param *p, u8 size, u8 bits, u64 fsize)
 	return 0;
 }
 
-int do_index(struct sw842_param *p, u8 n)
+static int do_index(struct sw842_param *p, u8 n)
 {
 	switch (n) {
 	case 2:
@@ -228,7 +228,7 @@ int do_index(struct sw842_param *p, u8 n)
 	}
 }
 
-int do_op(struct sw842_param *p, u8 o)
+static int do_op(struct sw842_param *p, u8 o)
 {
 	int i, ret = 0;