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-rw-r--r--src/htsconcat.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/htsconcat.c b/src/htsconcat.c
index c78513f..3553207 100644
--- a/src/htsconcat.c
+++ b/src/htsconcat.c
@@ -105,7 +105,7 @@ char *fslash(char *catbuff, size_t size, const char *a) {
}
// extension : html,gif..
-HTSEXT_API char *get_ext(char *catbuff, size_t size, const char *fil) {
+HTSEXT_API const char *get_ext(char *catbuff, size_t size, const char *fil) {
size_t i, last;
RUNTIME_TIME_CHECK_SIZE(size);