diff --git a/src/lib/ethumb/ethumb.c b/src/lib/ethumb/ethumb.c
index cf22911921..8a14385662 100644
--- a/src/lib/ethumb/ethumb.c
+++ b/src/lib/ethumb/ethumb.c
@@ -929,7 +929,7 @@ _ethumb_generate_hash(const char *file)
    EINA_SAFETY_ON_NULL_RETURN_VAL(file, NULL);
 
    uri = alloca(3 * strlen(file) + 9);
-   memcpy(uri, "file://", sizeof("file://") - 1);
+   memcpy(uri, "file://", sizeof("file://"));
    t = uri + sizeof("file://") - 1;
 
    for (c = (const unsigned char *)file; *c != '\0'; c++)