diff --git a/main.go b/main.go
index f40debf..ad9c870 100644
--- a/main.go
+++ b/main.go
@@ -1257,11 +1257,17 @@ func transformLink(args []string) ([]string, error) {
 		if pkgPath == "main" {
 			pkgPath = cache.MainImportPath
 		}
-		id := cache.ListedPackages[pkgPath].GarbleActionID
-		newName := hashWith(id, name)
+		lpkg := cache.ListedPackages[pkgPath]
+		if lpkg == nil {
+			// We couldn't find the package.
+			// Perhaps a typo, perhaps not part of the build.
+			// cmd/link ignores those, so we should too.
+			return
+		}
+		newName := hashWith(lpkg.GarbleActionID, name)
 		newPkg := pkg
 		if pkg != "main" && isPrivate(pkg) {
-			newPkg = hashWith(id, pkg)
+			newPkg = hashWith(lpkg.GarbleActionID, pkg)
 		}
 		flags = append(flags, fmt.Sprintf("-X=%s.%s=%s", newPkg, newName, str))
 	})
diff --git a/testdata/scripts/ldflags.txt b/testdata/scripts/ldflags.txt
index 1121447..3a7acc0 100644
--- a/testdata/scripts/ldflags.txt
+++ b/testdata/scripts/ldflags.txt
@@ -1,19 +1,21 @@
 # Note the proper domain, since the dot adds an edge case.
 env GOPRIVATE=domain.test/main
 
-garble build -ldflags='-X=main.unexportedVersion=v1.0.0 -X=domain.test/main/imported.ExportedVar=replaced'
+env LDFLAGS='-X=main.unexportedVersion=v1.0.0 -X=domain.test/main/imported.ExportedVar=replaced -X=domain.test/missing/path.missingVar=value'
+
+garble build -ldflags=${LDFLAGS}
 exec ./main
 cmp stderr main.stderr
 ! binsubstr main$exe 'unexportedVersion'
 
 [short] stop # no need to verify this with -short
 
-garble -tiny build -ldflags='-X=main.unexportedVersion=v1.0.0 -X=domain.test/main/imported.ExportedVar=replaced'
+garble -tiny build -ldflags=${LDFLAGS}
 exec ./main
 cmp stderr main.stderr
 ! binsubstr main$exe 'unexportedVersion'
 
-exec go build -ldflags='-X=main.unexportedVersion=v1.0.0 -X=domain.test/main/imported.ExportedVar=replaced'
+exec go build -ldflags=${LDFLAGS}
 exec ./main
 cmp stderr main.stderr
 binsubstr main$exe 'unexportedVersion'