diff --git a/src/cmd/go/internal/imports/build.go b/src/cmd/go/internal/imports/build.go
index bbe08da6b3..be308ceeec 100644
--- a/src/cmd/go/internal/imports/build.go
+++ b/src/cmd/go/internal/imports/build.go
@@ -36,8 +36,7 @@ var (
 
 	goBuildComment = []byte("//go:build")
 
-	errGoBuildWithoutBuild = errors.New("//go:build comment without // +build comment")
-	errMultipleGoBuild     = errors.New("multiple //go:build comments")
+	errMultipleGoBuild = errors.New("multiple //go:build comments")
 )
 
 func isGoBuildComment(line []byte) bool {
diff --git a/src/cmd/go/internal/modindex/build.go b/src/cmd/go/internal/modindex/build.go
index d6d4ea371a..8903c156bb 100644
--- a/src/cmd/go/internal/modindex/build.go
+++ b/src/cmd/go/internal/modindex/build.go
@@ -558,8 +558,7 @@ var (
 
 	goBuildComment = []byte("//go:build")
 
-	errGoBuildWithoutBuild = errors.New("//go:build comment without // +build comment")
-	errMultipleGoBuild     = errors.New("multiple //go:build comments")
+	errMultipleGoBuild = errors.New("multiple //go:build comments")
 )
 
 func isGoBuildComment(line []byte) bool {
diff --git a/src/go/build/build.go b/src/go/build/build.go
index 4bc34086b3..36d9165125 100644
--- a/src/go/build/build.go
+++ b/src/go/build/build.go
@@ -1487,8 +1487,7 @@ var (
 
 	goBuildComment = []byte("//go:build")
 
-	errGoBuildWithoutBuild = errors.New("//go:build comment without // +build comment")
-	errMultipleGoBuild     = errors.New("multiple //go:build comments")
+	errMultipleGoBuild = errors.New("multiple //go:build comments")
 )
 
 func isGoBuildComment(line []byte) bool {