diff --git a/src/cmd/compile/internal/gc/go.go b/src/cmd/compile/internal/gc/go.go
index f250c95..79b9d9f 100644
--- a/src/cmd/compile/internal/gc/go.go
+++ b/src/cmd/compile/internal/gc/go.go
@@ -647,6 +647,10 @@
 
 var flag_largemodel int
 
+// Whether we are adding any sort of code instrumentation, such as
+// when the race detector is enabled.
+var instrumenting bool
+
 // Pending annotations for next func declaration.
 var (
 	noescape       bool