diff --git a/filter.c b/filter.c
index 69cb45ca..208a723c 100644
--- a/filter.c
+++ b/filter.c
@@ -27,9 +27,9 @@
  * it -- to a sample taking up only as much space as required, with
  * unused probes removed.
  */
-int filter_probes(int in_unitsize, int out_unitsize, int *probelist,
-		  const char *data_in, uint64_t length_in, char **data_out,
-		  uint64_t *length_out)
+int sr_filter_probes(int in_unitsize, int out_unitsize, int *probelist,
+		     const char *data_in, uint64_t length_in, char **data_out,
+		     uint64_t *length_out)
 {
 	unsigned int in_offset, out_offset;
 	int num_enabled_probes, out_bit, i;
diff --git a/sigrok-proto.h b/sigrok-proto.h
index 3589024d..e007fd32 100644
--- a/sigrok-proto.h
+++ b/sigrok-proto.h
@@ -56,9 +56,9 @@ gboolean sr_device_has_hwcap(struct sr_device *device, int hwcap);
 
 /*--- filter.c --------------------------------------------------------------*/
 
-int filter_probes(int in_unitsize, int out_unitsize, int *probelist,
-		  const char *data_in, uint64_t length_in, char **data_out,
-		  uint64_t *length_out);
+int sr_filter_probes(int in_unitsize, int out_unitsize, int *probelist,
+		     const char *data_in, uint64_t length_in, char **data_out,
+		     uint64_t *length_out);
 
 /*--- hwplugin.c ------------------------------------------------------------*/