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-rw-r--r--extra/config/confdata.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/extra/config/confdata.c b/extra/config/confdata.c
index 694477fb6..114c76382 100644
--- a/extra/config/confdata.c
+++ b/extra/config/confdata.c
@@ -347,7 +347,7 @@ int conf_write(const char *name)
case no:
fprintf(out, "# %s is not set\n", sym->name);
if (out_h)
- fprintf(out_h, "#undef %s\n", sym->name);
+ fprintf(out_h, "#undef __%s__\n", sym->name);
break;
case mod:
fprintf(out, "%s=m\n", sym->name);