diff --git a/src/cmd/compile/internal/gc/lex.go b/src/cmd/compile/internal/gc/lex.go
index 25bc0399ce..7cce371408 100644
--- a/src/cmd/compile/internal/gc/lex.go
+++ b/src/cmd/compile/internal/gc/lex.go
@@ -50,6 +50,9 @@ const (
 
 	// Runtime and cgo type pragmas
 	NotInHeap // values of this type must not be heap allocated
+
+	// Go command pragmas
+	GoBuildPragma
 )
 
 const (
@@ -71,6 +74,8 @@ const (
 
 func pragmaFlag(verb string) PragmaFlag {
 	switch verb {
+	case "go:build":
+		return GoBuildPragma
 	case "go:nointerface":
 		if objabi.Fieldtrack_enabled != 0 {
 			return Nointerface
diff --git a/src/cmd/compile/internal/gc/noder.go b/src/cmd/compile/internal/gc/noder.go
index 5dce533e4b..c63c80dd36 100644
--- a/src/cmd/compile/internal/gc/noder.go
+++ b/src/cmd/compile/internal/gc/noder.go
@@ -242,6 +242,7 @@ func (p *noder) node() {
 	mkpackage(p.file.PkgName.Value)
 
 	if pragma, ok := p.file.Pragma.(*Pragma); ok {
+		pragma.Flag &^= GoBuildPragma
 		p.checkUnused(pragma)
 	}
 
diff --git a/test/directive.go b/test/directive.go
index 6167cd6279..37781c30d5 100644
--- a/test/directive.go
+++ b/test/directive.go
@@ -6,11 +6,16 @@
 
 // Verify that misplaced directives are diagnosed.
 
+// ok
+//go:build !ignore
+
 //go:noinline // ERROR "misplaced compiler directive"
 
 //go:noinline // ERROR "misplaced compiler directive"
 package main
 
+//go:build bad // ERROR "misplaced compiler directive"
+
 //go:nosplit
 func f1() {}
 
@@ -93,3 +98,5 @@ type T6 = int
 
 // EOF
 //go:noinline // ERROR "misplaced compiler directive"
+
+//go:build bad // ERROR "misplaced compiler directive"