diff --git a/src/cmd/compile/internal/gc/dcl.go b/src/cmd/compile/internal/gc/dcl.go
index 99f29f4830d0fd..157f525b1961ab 100644
--- a/src/cmd/compile/internal/gc/dcl.go
+++ b/src/cmd/compile/internal/gc/dcl.go
@@ -182,7 +182,7 @@ func declare(n *Node, ctxt uint8) {
 	s := n.Sym
 
 	// kludgy: typecheckok means we're past parsing.  Eg genwrapper may declare out of package names later.
-	if importpkg == nil && typecheckok == 0 && s.Pkg != localpkg {
+	if importpkg == nil && !typecheckok && s.Pkg != localpkg {
 		Yyerror("cannot declare name %v", s)
 	}
 
diff --git a/src/cmd/compile/internal/gc/go.go b/src/cmd/compile/internal/gc/go.go
index b692fc826c3cac..8c7328fa4bb990 100644
--- a/src/cmd/compile/internal/gc/go.go
+++ b/src/cmd/compile/internal/gc/go.go
@@ -638,7 +638,7 @@ var thunk int32
 
 var Funcdepth int32
 
-var typecheckok int
+var typecheckok bool
 
 var compiling_runtime int
 
diff --git a/src/cmd/compile/internal/gc/lex.go b/src/cmd/compile/internal/gc/lex.go
index 863fa8860b73d5..3fab3582ed5844 100644
--- a/src/cmd/compile/internal/gc/lex.go
+++ b/src/cmd/compile/internal/gc/lex.go
@@ -360,7 +360,7 @@ func Main() {
 	mkpackage(localpkg.Name) // final import not used checks
 	lexfini()
 
-	typecheckok = 1
+	typecheckok = true
 	if Debug['f'] != 0 {
 		frame(1)
 	}
@@ -799,7 +799,7 @@ func importfile(f *Val, line int) {
 	curio.peekc1 = 0
 	curio.infile = file
 	curio.nlsemi = 0
-	typecheckok = 1
+	typecheckok = true
 
 	var c int32
 	for {
@@ -836,7 +836,7 @@ func unimportfile() {
 
 	pushedio.bin = nil
 	incannedimport = 0
-	typecheckok = 0
+	typecheckok = false
 }
 
 func cannedimports(file string, cp string) {
@@ -852,7 +852,7 @@ func cannedimports(file string, cp string) {
 	curio.nlsemi = 0
 	curio.importsafe = false
 
-	typecheckok = 1
+	typecheckok = true
 	incannedimport = 1
 }
 
diff --git a/src/cmd/compile/internal/gc/typecheck.go b/src/cmd/compile/internal/gc/typecheck.go
index 502c62c252d75e..ff394f4f5e9fe7 100644
--- a/src/cmd/compile/internal/gc/typecheck.go
+++ b/src/cmd/compile/internal/gc/typecheck.go
@@ -118,7 +118,7 @@ var typecheck_tcfree *NodeList
 
 func typecheck(np **Node, top int) *Node {
 	// cannot type check until all the source has been parsed
-	if typecheckok == 0 {
+	if !typecheckok {
 		Fatalf("early typecheck")
 	}