diff --git a/go/store/nbs/table_reader.go b/go/store/nbs/table_reader.go
index 710c2afa92..d46b651e5f 100644
--- a/go/store/nbs/table_reader.go
+++ b/go/store/nbs/table_reader.go
@@ -41,7 +41,7 @@ import (
 )
 
 // Do not read more than 128MB at a time.
-const maxReadSize = 128 * 1024 * 1024 * 1024
+const maxReadSize = 128 * 1024 * 1024
 
 // CompressedChunk represents a chunk of data in a table file which is still compressed via snappy.
 type CompressedChunk struct {
diff --git a/go/store/nbs/table_reader_test.go b/go/store/nbs/table_reader_test.go
index 296b94c740..41439426ef 100644
--- a/go/store/nbs/table_reader_test.go
+++ b/go/store/nbs/table_reader_test.go
@@ -115,7 +115,7 @@ func TestCanReadAhead(t *testing.T) {
 		testCase{offsetRec{offset: 8191, length: 2048}, 0, 4096, 4096, expected{end: 10239, can: true}},
 		testCase{offsetRec{offset: 8191, length: 2048}, 0, 4096, 2048, expected{end: 4096, can: false}},
 		testCase{offsetRec{offset: 2048, length: 2048}, 0, 4096, 2048, expected{end: 4096, can: true}},
-		testCase{offsetRec{offset: 137438953472, length: 2048}, 0, 137438953472, 4096, expected{end: 137438953472, can: false}},
+		testCase{offsetRec{offset: (1 << 27), length: 2048}, 0, 128 * 1024 * 1024, 4096, expected{end: 134217728, can: false}},
 	} {
 		end, can := canReadAhead(c.rec, c.start, c.end, c.blockSize)
 		assert.Equal(t, c.ex.end, end)