diff --git a/src/pack.c b/src/pack.c
index 2e89047..28f41ad 100644
--- a/src/pack.c
+++ b/src/pack.c
@@ -350,7 +350,7 @@ void* pack_readfile(const char* packfile, const char* filename, uint32_t* filesi
     return NULL;
   }
   DEBUG("Read %d bytes from '%s'", bytes, filename);
-  memset(buf+size, '\0', 1); // Append size '\0' for it to validate as a string.
+  memset(buf+size, 0, 1); // Append size '\0' for it to validate as a string.
 
   // Check the md5.
   md5_state_t md5;