diff --git a/src/cmd/cgo/main.go b/src/cmd/cgo/main.go
index 946245bbe7..7a78cd270d 100644
--- a/src/cmd/cgo/main.go
+++ b/src/cmd/cgo/main.go
@@ -388,8 +388,8 @@ func main() {
 	// we use to coordinate between gcc and ourselves.
 	// We already put _cgo_ at the beginning, so the main
 	// concern is other cgo wrappers for the same functions.
-	// Use the beginning of the 32 bytes hash of the input to disambiguate.
-	h := hash.New32()
+	// Use the beginning of the 16 bytes hash of the input to disambiguate.
+	h := hash.New16()
 	io.WriteString(h, *importPath)
 	var once sync.Once
 	var wg sync.WaitGroup
diff --git a/src/cmd/compile/internal/types/fmt.go b/src/cmd/compile/internal/types/fmt.go
index f316a23b90..96c63528ec 100644
--- a/src/cmd/compile/internal/types/fmt.go
+++ b/src/cmd/compile/internal/types/fmt.go
@@ -644,7 +644,7 @@ func SplitVargenSuffix(name string) (base, suffix string) {
 func TypeHash(t *Type) uint32 {
 	p := t.LinkString()
 
-	// Using 32 bytes hash is overkill, but reduces accidental collisions.
-	h := hash.Sum32([]byte(p))
+	// Using 16 bytes hash is overkill, but reduces accidental collisions.
+	h := hash.Sum16([]byte(p))
 	return binary.LittleEndian.Uint32(h[:4])
 }
diff --git a/src/cmd/internal/obj/sym.go b/src/cmd/internal/obj/sym.go
index 0fd0eb7f0f..ac43a812b9 100644
--- a/src/cmd/internal/obj/sym.go
+++ b/src/cmd/internal/obj/sym.go
@@ -207,7 +207,7 @@ func (ctxt *Link) Int128Sym(hi, lo int64) *LSym {
 
 // GCLocalsSym generates a content-addressable sym containing data.
 func (ctxt *Link) GCLocalsSym(data []byte) *LSym {
-	sum := hash.Sum32(data)
+	sum := hash.Sum16(data)
 	str := base64.StdEncoding.EncodeToString(sum[:16])
 	return ctxt.LookupInit(fmt.Sprintf("gclocals·%s", str), func(lsym *LSym) {
 		lsym.P = data
diff --git a/src/cmd/objdump/objdump_test.go b/src/cmd/objdump/objdump_test.go
index 103517641e..e78f2d3f96 100644
--- a/src/cmd/objdump/objdump_test.go
+++ b/src/cmd/objdump/objdump_test.go
@@ -126,7 +126,7 @@ func testDisasm(t *testing.T, srcfname string, printCode bool, printGnuAsm bool,
 		goarch = f[1]
 	}
 
-	hash := hash.Sum32([]byte(fmt.Sprintf("%v-%v-%v-%v", srcfname, flags, printCode, printGnuAsm)))
+	hash := hash.Sum16([]byte(fmt.Sprintf("%v-%v-%v-%v", srcfname, flags, printCode, printGnuAsm)))
 	tmp := t.TempDir()
 	hello := filepath.Join(tmp, fmt.Sprintf("hello-%x.exe", hash))
 	args := []string{"build", "-o", hello}