diff --git a/src/debug/pe/file.go b/src/debug/pe/file.go
index aa0955a133..e8b1a4f5e2 100644
--- a/src/debug/pe/file.go
+++ b/src/debug/pe/file.go
@@ -322,7 +322,7 @@ func (f *File) ImportedSymbols() ([]string, error) {
 		return nil, nil
 	}
 
-	pe64 := f.Machine == IMAGE_FILE_MACHINE_AMD64 || f.Machine == IMAGE_FILE_MACHINE_ARM64
+	_, pe64 := f.OptionalHeader.(*OptionalHeader64)
 
 	// grab the number of data directory entries
 	var dd_length uint32