diff --git a/sha3/sha3_test.go b/sha3/sha3_test.go
index 79d962e..cbf811d 100644
--- a/sha3/sha3_test.go
+++ b/sha3/sha3_test.go
@@ -23,7 +23,7 @@ import (
 
 const (
 	testString  = "brekeccakkeccak koax koax"
-	katFilename = "keccakKats.json.deflate"
+	katFilename = "testdata/keccakKats.json.deflate"
 )
 
 // Internal-use instances of SHAKE used to test against KATs.
diff --git a/sha3/keccakKats.json.deflate b/sha3/testdata/keccakKats.json.deflate
similarity index 100%
rename from sha3/keccakKats.json.deflate
rename to sha3/testdata/keccakKats.json.deflate