diff --git a/src/cmd/compile/internal/gc/go.go b/src/cmd/compile/internal/gc/go.go
index 65d8946849..b1ead93c34 100644
--- a/src/cmd/compile/internal/gc/go.go
+++ b/src/cmd/compile/internal/gc/go.go
@@ -293,4 +293,8 @@ var (
 	typedmemmove,
 	typedmemclr,
 	Udiv *obj.LSym
+
+	// GO386=387
+	ControlWord64trunc,
+	ControlWord32 *obj.LSym
 )
diff --git a/src/cmd/compile/internal/gc/ssa.go b/src/cmd/compile/internal/gc/ssa.go
index 1497c5c2f5..9c1b3ca69f 100644
--- a/src/cmd/compile/internal/gc/ssa.go
+++ b/src/cmd/compile/internal/gc/ssa.go
@@ -92,6 +92,10 @@ func initssaconfig() {
 	typedmemmove = Sysfunc("typedmemmove")
 	typedmemclr = Sysfunc("typedmemclr")
 	Udiv = Sysfunc("udiv")
+
+	// GO386=387 runtime functions
+	ControlWord64trunc = Sysfunc("controlWord64trunc")
+	ControlWord32 = Sysfunc("controlWord32")
 }
 
 // buildssa builds an SSA function for fn.
diff --git a/src/cmd/compile/internal/x86/387.go b/src/cmd/compile/internal/x86/387.go
index 5bf14109b2..cdac000648 100644
--- a/src/cmd/compile/internal/x86/387.go
+++ b/src/cmd/compile/internal/x86/387.go
@@ -120,7 +120,7 @@ func ssaGenValue387(s *gc.SSAGenState, v *ssa.Value) {
 			p = s.Prog(x86.AFLDCW)
 			p.From.Type = obj.TYPE_MEM
 			p.From.Name = obj.NAME_EXTERN
-			p.From.Sym = gc.Sysfunc("controlWord32")
+			p.From.Sym = gc.ControlWord32
 		}
 
 		var op obj.As
@@ -210,7 +210,7 @@ func ssaGenValue387(s *gc.SSAGenState, v *ssa.Value) {
 		p = s.Prog(x86.AFLDCW)
 		p.From.Type = obj.TYPE_MEM
 		p.From.Name = obj.NAME_EXTERN
-		p.From.Sym = gc.Sysfunc("controlWord64trunc")
+		p.From.Sym = gc.ControlWord64trunc
 
 		// Now do the conversion.
 		p = s.Prog(x86.AFMOVLP)