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-rw-r--r--src/lib/util.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/lib/util.cc b/src/lib/util.cc
index 667ee8ce9..baa37ae7c 100644
--- a/src/lib/util.cc
+++ b/src/lib/util.cc
@@ -807,7 +807,7 @@ tidy_for_filename (string f)
{
string t;
for (size_t i = 0; i < f.length(); ++i) {
- if (isalpha (f[i]) || f[i] == '_' || f[i] == '-') {
+ if (isalnum (f[i]) || f[i] == '_' || f[i] == '-') {
t += f[i];
} else {
t += '_';