diff --git a/src/cmd/go/internal/work/exec.go b/src/cmd/go/internal/work/exec.go
index bb71faac9cf..62651cc6830 100644
--- a/src/cmd/go/internal/work/exec.go
+++ b/src/cmd/go/internal/work/exec.go
@@ -268,7 +268,7 @@ func (b *Builder) buildActionID(a *Action) cache.ActionID {
 		fmt.Fprintf(h, "compile %s %q %q\n", id, forcedGccgoflags, p.Internal.Gccgoflags)
 		fmt.Fprintf(h, "pkgpath %s\n", gccgoPkgpath(p))
 		if len(p.SFiles) > 0 {
-			id, err = b.gccgoToolID(BuildToolchain.compiler(), "assembler-with-cpp")
+			id, _ = b.gccgoToolID(BuildToolchain.compiler(), "assembler-with-cpp")
 			// Ignore error; different assembler versions
 			// are unlikely to make any difference anyhow.
 			fmt.Fprintf(h, "asm %q\n", id)