diff --git a/libgo/mksysinfo.sh b/libgo/mksysinfo.sh
index 5f7b5f0..d616bd8 100755
--- a/libgo/mksysinfo.sh
+++ b/libgo/mksysinfo.sh
@@ -1123,7 +1123,7 @@
 # Prefer largefile variant if available.
 # CentOS 5 does not have f_flags, so pull from f_spare.
 statfs=`grep '^type _statfs64 ' gen-sysinfo.go || true`
-if test "$statfs" == ""; then
+if test "$statfs" = ""; then
   statfs=`grep '^type _statfs ' gen-sysinfo.go || true`
 fi
 if ! echo "$statfs" | grep f_flags; then