diff --git a/applypatch/applypatch.c b/applypatch/applypatch.c
index 09ca2ad..00004e9 100644
--- a/applypatch/applypatch.c
+++ b/applypatch/applypatch.c
@@ -472,7 +472,7 @@
 // Search an array of sha1 strings for one matching the given sha1.
 // Return the index of the match on success, or -1 if no match is
 // found.
-int FindMatchingPatch(uint8_t* sha1, char** const patch_sha1_str,
+int FindMatchingPatch(uint8_t* sha1, const char** patch_sha1_str,
                       int num_patches) {
     int i;
     uint8_t patch_sha1[SHA_DIGEST_SIZE];