diff --git a/experimental/tracer/main/http.go b/experimental/tracer/main/http.go
index e1fcdb42d..53ca11d0c 100644
--- a/experimental/tracer/main/http.go
+++ b/experimental/tracer/main/http.go
@@ -4,11 +4,12 @@ import (
 	"encoding/json"
 	"fmt"
 	"log"
+	"mime"
 	"net/http"
 	"strconv"
 
-	"github.com/gorilla/mux"
 	dockerClient "github.com/fsouza/go-dockerclient"
+	"github.com/gorilla/mux"
 
 	"github.com/weaveworks/scope/probe/docker"
 	"github.com/weaveworks/scope/probe/process"
@@ -110,12 +111,12 @@ func (t *tracer) http(port int) {
 		w.WriteHeader(204)
 	})
 
-
-
 	router.Methods("GET").Path("/traces").HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		respondWith(w, http.StatusOK, t.store.Traces())
 	})
 
+	mime.AddExtensionType(".svg", "image/svg+xml")
+
 	router.Methods("GET").PathPrefix("/").Handler(http.FileServer(FS(false))) // everything else is static
 
 	log.Printf("Launching HTTP API on port %d", port)
diff --git a/experimental/tracer/ptrace/thread.go b/experimental/tracer/ptrace/thread.go
index 61e3fdfbc..af663d2d4 100644
--- a/experimental/tracer/ptrace/thread.go
+++ b/experimental/tracer/ptrace/thread.go
@@ -16,6 +16,7 @@ const (
 	STAT          = 4
 	MMAP          = 9
 	MPROTECT      = 10
+	SELECT        = 23
 	MADVISE       = 28
 	SOCKET        = 41
 	CONNECT       = 42
@@ -97,7 +98,7 @@ func (t *thread) syscallStopped() {
 		t.handleIO(&t.callRegs, &t.resultRegs)
 
 	// we can ignore these syscalls
-	case SETROBUSTLIST, GETID, MMAP, MPROTECT, MADVISE, SOCKET, CLONE, STAT:
+	case SETROBUSTLIST, GETID, MMAP, MPROTECT, MADVISE, SOCKET, CLONE, STAT, SELECT:
 		return
 
 	default: