diff --git a/include/haproxy/sample.h b/include/haproxy/sample.h
index e1d0a868d..5f4a6cb08 100644
--- a/include/haproxy/sample.h
+++ b/include/haproxy/sample.h
@@ -41,6 +41,7 @@ struct sample *sample_fetch_as_type(struct proxy *px, struct session *sess,
                                    struct stream *strm, unsigned int opt,
                                    struct sample_expr *expr, int smp_type);
 int sample_conv_var2smp_sint(const struct arg *arg, struct sample *smp);
+int sample_conv_var2smp_str(const struct arg *arg, struct sample *smp);
 void release_sample_expr(struct sample_expr *expr);
 void sample_register_fetches(struct sample_fetch_kw_list *psl);
 void sample_register_convs(struct sample_conv_kw_list *psl);
diff --git a/src/sample.c b/src/sample.c
index 64a4b573c..67853d296 100644
--- a/src/sample.c
+++ b/src/sample.c
@@ -1744,7 +1744,7 @@ static int sample_conv_sha2(const struct arg *arg_p, struct sample *smp, void *p
  *
  * This function returns 0 if an error occurs, otherwise it returns 1.
  */
-static inline int sample_conv_var2smp_str(const struct arg *arg, struct sample *smp)
+int sample_conv_var2smp_str(const struct arg *arg, struct sample *smp)
 {
 	switch (arg->type) {
 	case ARGT_STR: