diff --git a/web/Makefile b/web/Makefile
index 4f3cf0980..ba0e5a7d8 100644
--- a/web/Makefile
+++ b/web/Makefile
@@ -13,10 +13,16 @@
 
 all: blob
 
-blob:
+blob: static/generated/protocol_buffer.descriptor
 	$(MAKE) -C blob
 
 clean:
 	$(MAKE) -C blob clean
 
+static/generated:
+	mkdir -vp static/generated
+
+static/generated/protocol_buffer.descriptor: static/generated ../model/generated/descriptor.blob
+	cp ../model/generated/descriptor.blob -f $@
+
 .PHONY: blob clean
diff --git a/web/blob/Makefile b/web/blob/Makefile
index 171d1affb..5c64fa192 100644
--- a/web/blob/Makefile
+++ b/web/blob/Makefile
@@ -15,14 +15,8 @@ all: files.go
 
 SUFFIXES:
 
-generated:
-	mkdir -vp generated
-
-generated/protocol_buffer.descriptor: generated ../../model/generated/descriptor.blob
-	cp ../../model/generated/descriptor.blob -f $@
-
-files.go: $(shell find ../templates/ ../static/ -type f) generated/protocol_buffer.descriptor
-	../../utility/embed-static.sh ../static ../templates ./generated | gofmt > $@
+files.go: $(shell find ../templates/ ../static/ -type f)
+	../../utility/embed-static.sh ../static ../templates | gofmt > $@
 
 clean:
 	-rm  files.go
diff --git a/web/blob/blob.go b/web/blob/blob.go
index 5ba0b0ee2..2edd278b9 100644
--- a/web/blob/blob.go
+++ b/web/blob/blob.go
@@ -16,8 +16,9 @@ const (
 )
 
 var mimeMap = map[string]string{
-	"css": "text/css",
-	"js":  "text/javascript",
+	"css":        "text/css",
+	"js":         "text/javascript",
+	"descriptor": "application/vnd.google.protobuf;proto=google.protobuf.FileDescriptorSet",
 }
 
 func GetFile(bucket string, name string) ([]byte, error) {